Construction of Third floor above existing building of Tripura State Cooperative Bank 3rd Call

Reinforced cement concrete work in walls (any thickness), including attached pilasters, buttresses, plinth and skirting courses, fillets, columns, pillars, piers, abutments, posts and struts etc. upto floor five level excluding cost of centring, shuttering, finishing and reinforcement- (i) 1:1½:3 ( 1 Cement: 1½ fine sand : 3 graded stone aggregate 20 mm nominal size)

Reinforced cement concrete work in walls (any thickness), including attached pilasters, buttresses, plinth and skirting courses, fillets, columns, pillars, piers, abutments, posts and struts etc. upto floor five level excluding cost of centring, shuttering, finishing and reinforcement- (i) 1:1½:3 ( 1 Cement: 1½ fine sand : 3 graded stone aggregate 20 mm nominal size)

Reinforced cement concrete work in vertical and horizontal fins individually or forming box louvers, facias and eaves boards above plinth level up to floor five level, excluding the cost of centering, shuttering, finishing and reinforcement with (i) 1:1½:3 ( 1 Cement: 1½ fine sand : 3 graded stone aggregate 20 mm nominal size)

Reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete above plinth level. (i) Thermo-Mechanically Treated bars of grade Fe-500D or more

Centering shuttering including struttings, propping etc. and removal of form work for: (i) Suspended floors, roofs, landings, balconies and access platform with 12 mm thick shuttering ply

ii) Lintels, beams, plinth beams, girders, bressumers and cantilevers with shuttering ply

iii) Columns, Pillars, Piers, Abutments, Posts and Struts with shuttering ply

iv) Stairs (excluding landings) except spiral-staircases with wooden plank

v) Vertical and horizontal fins individually or forming box louvers band, facias and eaves boards.

vi) Weather shade, Chajjas, corbels etc., including edges.

vii) Walls (any thickness) including attached pilasters, buttresses, plinth and string courses etc. using shuttering ply

Providing precast cement concrete Jali 1:2:4 (1 cement: 2 coarse sand : 4 graded stone aggregate 6mm nominal size) reinforced with 1.6 mm dia mild steel wire including centring and shuttering, roughening cleaning, fixing and finishing in cement mortar 1:3(1cement : 3 fine sand) etc. complete, excluding the plastering of jambs, sills and soffits (i) 50 mm thick

(B) S.H. BRICK WORK First class brick work in superstructure above plinth level & upto floor-five level including cost of all materials as required complete:- (i) In cement mortar 1:6 ( 1 cement : 6 fine sand ).

Half brick masonry work with first class bricks in superstructure upto floor five level including cost of all materials as required complete:- (i) In Cement mortar 1:4 ( 1 cement : 4 fine sand )

Extra for providing & placing in position 2 nos 6mm dia MS bars at every 6th course of full brick masonry work including anchorage in joints of 75 mm in each side in superstructure for all level including cost of all materials as required complete:- (i) In cement mortar 1:6 ( 1 cement : 6 fine sand ).

Extra for providing & placing in position 2 nos 6mm dia MS bars at every 4th course of half brick masonry work including anchorage in joints of 75 mm in each side in superstructure for all level including cost of all materials as required complete:- (i) In Cement mortar 1:4 ( 1 cement : 4 fine sand )

(C) S.H. STEEL, WOOD, Aluminium & PVC WORK Providing and fixing fan clamp type-I of 16 mm dia M.S. bar bent to shape with hooked ends in R.C.C. slabs during laying including painting the exposed portion of loop, all as per standard design complete.

Providing and fixing aluminium work for doors, windows, ventilators and partitions with extruded built up standard tubular sections/ appropriate Z sections and other sections of approved make conforming to IS: 733 and IS : 1285, fixing with dash fasteners of required dia and size, including necessary filling up of gaps at junctions, i.e. at top, bottom and sides with required EPDM rubber/neoprene gasket etc. Aluminium sections shall be smooth, rust free, straight, mitred and jointed mechanically wherever required including cleat angle, aluminium snap beading for glazing / paneling, C.P. brass / stainless steel screws, all complete as per architectural drawing and the direction of Engineerincharge. (Glazing and paneling and dash fasteners to be paid for separately :- (a) For fixed portion of approved quality:- (i) Anodised aluminium (anodised transparent or dyed to required shade according to IS: 1868, Minimum anodic coating of grade AC 15).

b) For shutters of doors, windows & ventilators including providing and fixing hinges / pivots and making provision for fixing fittings wherever required including the cost of EPDM rubber / neoprene gasket required ( Fittings shall be paid for separately :- (i) Anodised aluminium (anodised transparent or dyed to required shade according to IS: 1868, Minimum anodic coating of grade AC 15).

Providing and fixing glazing of approved quality in aluminium doors, windows, ventilator, shutters and partition etc. with EPDM rubber / neoprene gasket etc. complete as per architectural drawing and the direction of Engineer-in-charge (Cost of snap beading shall be paid in basic item) :- (a) With float glass panes of 4.0 mm thickness ( weight not less than 10.0 kg / sqm )

b) With float glass panes of 5.5 mm thickness ( weight not less than 13.75 kg / sqm )

Filling the gap in between aluminium frame and adjacent RCC/brick work by providing weather silicon sealant over backer rod of approved quality etc. complete as per architectural drawing and direction of the Engineer-in charge:- (i) Upto 5 mm depth and 5 mm width.

Providing and fixing factory made door frame (single rebate) made of solid PVC foam profile with homogenous fine cellular structure having smooth outer integral skin having 60mm width & 30mm thickness and shall be fixed to wall as per instructions of Engineer-In-Charge using 100x8 sheet metal CSK screws.

Providing and fixing 28 mm thick door shutter made of solid PVC foam profile with homogenous fine cellular structure having smooth outer integral skin having 71mm width & 28mm thick as vertical & horizontal styles. Joints are made using solvent adhesive and GI ‘C sections (39mm x 19mm x 0.6mm thick) or M S pipe (40mm x 20mm ) stiffener frame insert & telescopic polymeric ‘L’ corners .The panel shall be filled with 3mm thick high - pressure compact laminate as per manufacturer’s specifications and directions of the Engineer-in-charge, cover moulding shall be provided for covering fixing screws and elegant look.( for W.C. bathroom door shutter).

Providing and fixing in position collapsible steel shutters with vertical channels 20x10x2mm at 100 mm centre to centre and braced with flat iron diagonals 20x5mm size with top and bottom rail of T-iron 40x40x6mm with 40mm dia. steel pulleys & with riveted bolts, nuts, locking arrangement, stoppers, handles, hold fast /anchor bolt including embedding in cement concrete of required grade for fixing in position, all necessary fittings, including applying a priming coat of approved steel primer etc. complete as required.

Providing and fixing aluminium sliding door bolts ISI marked anodised (anodic coating not less than grade AC 10 as per IS : 1868) transparent or dyed to required colour or shade with nuts and screws etc. complete : (i) 300 x 16 mm

Providing and fixing aluminium tower bolts ISI marked anodised (anodic coating not less than grade AC 10 as per IS : 1868 ) transparent or dyed to required colour or shade with necessary screws etc. complete :(i) 300 x 10 mm

ii) 150 x 10 mm

Providing and fixing aluminium handles ISI marked anodised (anodic coating not less than grade AC 10 as per IS : 1868) transparent or dyed to required colour or shade with necessary screws etc. complete : (i) 125 mm

Providing and fixing aluminium hanging floor door stopper ISI marked anodised (anodic coating not less than grade AC 10 as per IS : 1868) transparent or dyed to required colour and shade with necessary screws etc. complete. (i) Single rubber stopper

Providing and fixing 100 mm brass locks (best make of approved quality) with 6 levers without pair of handles for aluminium doors including necessary cutting and making good etc. complete as per direction of Engineer-in-charge.

Providing and fixing IS : 3564 marked aluminium extruded section body tubular type universal hydraulic door closer with double speed adjustment with necessary accessories and screws etc. complete.

Providing and fixing double action hydraulic floor spring of approved brand and manufacture conforming to IS : 6315, having brand logo embrossed on the body / plate with double spring mechanism and door weight upto 125 kg. for doors, including cost of cutting floors, embedding in floors as required and making good the same matching to the existing floor finishing and cover plates with brass pivot and single piece MS sheet outer box with slide plate etc. complete as per direction of the Engineer-in-charge:- (i) With stainless steel cover plate minimum 1.25 mm thickness

Providing and fixing M.S. grills of required pattern in frames of windows etc. with M.S. flats, square or round bars etc. all complete. (i) Fixed to openings /wooden frames with rawl plugs screws etc.

Providing and fixing stainless steel (Grade 304) railing made of Hollow tubes, channels, plates etc., including welding, grinding, buffing, polishing and making curvature (wherever required) and fitting the same with necessary stainless steel nuts and bolts complete, including fixing the railing with necessary accessories & stainless steel dash fasteners , stainless steel bolts etc., of required size, on the top of the floor or the side of waist slab with suitable arrangement as per approval of Engineer-in-charge, (for payment purpose only weight of stainless steel members shall be considered excluding fixing accessories such as nuts, bolts, fasteners etc.).

Providing and fixing 1mm thick M.S. sheet door with frame of 40x40x6mm angle iron and 3mm M.S. gusset plates at the junctions and corners, & with cleats with bolts & nuts, rivets, locking arrangement, handles, hooks & eyes, pinlets including embedding in cement concrete of required grade for fixing in position, all necessary fittings, including applying a priming coat of approved steel primer etc. complete as required:- (i) Using M.S. angels 40x40x6 mm for diagonal braces.

(D) S.H. FLOORING WORK Providing and fixing Marble stone in floors over 20 mm thick bed of cement mortar 1 : 4 ( 1 cement : 4 fine sand) jointed with ordinary cement slurry including pointingwith white cement mixed with of matching shade, including rubbing and polishing etc. all complete as per direction of Engineer-in-charge. (a) 14 mm thick Marble stone (i) Raj Nagar plain marble

Extra for marble flooring complete in treads of steps and risers using single length upto 2.00 metre.

Extra for pre-finished nosing to treads of steps of marble stone.

Providing and fixing Kota stone in floors over 20 mm thick bed of cement mortar 1 : 4 ( 1 cement : 4 fine sand ) jointed with ordinary cement slurry including pointing with ordinary cement mixed with pigment of matching shade, including rubbing and polishing etc. all complete as per direction of Engineer-in-charge. (i) Kota stone slab 25 mm thick

Providing and fixing 1st class quality ceramic glazed wall tiles conforming to IS : 15622 - 2017 (thickness to be specified by the manufacturer) of approved make in all colours, shades of any size as approved by Engineer-incharge in skirting, risers of steps and dados, laid over 12 mm thick bed of cement mortar 1 : 3 (1 cement : 3 fine sand) jointed with ordinary cement slurry including pointing with white cement mixed with pigment of matching shade etc. all complete as per direction of the Engineer in-charge. (i) 600 mm X 300 mm in all shades and design

Stone tile (polished) work for wall lining over 12mm thick bed of cement mortar 1:3 (1 cement :3 fine sand) and cement slurry @ 3.3 kg/sqm including pointing in white cement complete including rubbing, curing etc. complete at all levels as required:-i) 8 mm thick (a)Granite of any colour and shade duly approved .

Providing and laying 1st class quality vitrified floor tiles in different sizes (thickness to be specified by the manufacturer) with water absorption less than 0.08% and conforming to IS: 15622 - 2017, of approved make, in all colours and shades, laid over 20mm thick cement mortar 1:4 (1 cement : 4 fine sand), jointing with grey cement slurry @ 3.3 kg/ sqm including grouting the joints with white cement and matching pigments etc. all complete as per direction of the Engineer-in-charge. (a) Glazed Vitrified Tiles (Glossy / Mat Finish/ Anti-Skid) (i) Size of tile 600 mm x 600 mm

(E) S.H. FINISHING WORK 12 mm cement plaster of mix (i) Cement mortar 1:6 (1 cement : 6 fine sand)

15 mm cement plaster on the rough side of single or half brick wall of mix: (i) Cement mortar 1:6 (1 cement : 6 fine sand)

6 mm cement plaster of mix : (i) Cement mortar 1:3 (1 cement : 3 fine sand)

Providing and applying plaster of paris putty of 2 mm thickness over plastered surface to prepare the surface even and smooth complete.

Wall painting with acrylic plastic emulsion paint of approved brand and manufacture to give an even shade [Payment shall be made after submission of Test Certificate issued by the Manufacturer] : (i) Two or more coats on new work

Finishing walls with acrylic smooth exterior paint of required shade of approved brand and manufacture [Payment shall be made after submission of Test Certificate issued by the Manufacturer] : (i) New work ( two or more coats applied @ 1.67 litre/10 sqm over and including priming coat of exterior primer applied @ 2.20 kg/10 sqm)

Finishing walls with acrylic smooth exterior paint of required shade of approved brand and manufacture on old work ( one or more coats ) including preparation of surface as required complete as per direction of the Engineer in charge.

Distempering with 1st quality acrylic distemper (ready mixed) having VOC content less than 50 grams/ litre, of approved brand and manufacture to give an even shade [Payment shall be made after submission of Test Certificate issued by the Manufacturer] : (i) New work ( two or more coats) over and including water thinnable priming coat with cement primer.

Applying priming coat [Payment shall be made after submission of Test Certificate issued by the Manufacturer] : (i) With ready mixed red oxide zinc chromate primer of approved brand and manufacture on steel galvanised iron/ steel works

Painting with synthetic enamel paint of approved brand and manufacture to give an even shade [Payment shall be made after submission of Test Certificate issued by the Manufacturer]: (i) Two or more coats on new work

(F) S.H. SANITARY AND WATER SUPPLY WORK Providing and fixing water closet squatting pan (Indian type W.C. pan ) with 100mm sand cast Iron P or S trap, 10 litre low level white P.V.C. flushing cistern with manually controlled device (handle lever) conforming to IS : 7231, with all fittings and fixtures complete including cutting and making good the walls and floors wherever required : (i) White Vitreous china Orrisa pattern W.C. pan of size 580x440 mm with integral type foot rests.

Providing and fixing white vitreous china pedestal type water closet (European type W.C. pan) with seat and lid, 10 litre low level white P.V.C. flushing cistern with manually controlled device (handle lever), conforming to IS : 7231, with all fittings and fixtures complete including cutting and making good the walls and floors wherever required : (i) W.C. pan with ISI marked white solid plastic seat and lid

Providing and Fixing white vitreous china flat back or wall corner type lipped front urinal basin of 430x260x350mm and 340x410x265mm sizes respectively with automatic flushing cistern with standard flush pipe and C.P. brass spreaders with brass unions and G.I clamps complete, including painting of fittings and brackets, cutting and making good the walls and floors wherever required : (i) One urinal basin with 5 litre white P.V.C. automatic flushing cistern.

Providing and fixing white vitreous china squatting plate urinal with integral rim longitudinal flush pipe.

Providing and fixing wash basin with C.I. brackets, 15 mm C.P. brass pillar taps,32 mm C.P. brass waste of standard pattern, including painting of fittings and brackets, cutting and making good the walls wherever require : (i) White Vitreous China Wash basin size 630x450 mm with a single 15 mm C.P. brass pillar taps.

Providing and fixing white vitreous china pedestal for wash basin completely recessed at the back for the reception of pipes and fittings.

Providing and fixing 600x450 mm bevelled edge mirror of superior glass (of approved quality) complete with 6 mm thick hard board ground fixed to wooden cleats with C.P. brass screws and washers complete.

Providing and fixing 600x120x5mm glass shelf with edges round of supported on anodised aluminium angle frame with C.P. brass brackets and guard rail complete fixed with 40 mm long screws, rawl plugs etc., complete.

Providing and fixing PTMT towel rail complete with brackets fixed to wooden cleats with CP brass screws with concealed fitting arrangement of approved quality and colour. (i) 600mm long towel rail with total length of 645mm, width 78mm and effective height of 88mm, weighing not less than 190gms.

Providing and fixing PTMT soap Dish Holder having length of 138mm, breadth 102mm, height of 75mm with concealed fitting arrangements weighing not less than 106 gms.

Providing and fixing 100 mm sand cast Iron grating for gully trap.

Providing and fixing P.V.C. waste pipe for sink or wash basin including P.V.C. waste fittings complete. (a) Flexible pipe (i) 32 mm dia

Providing and fixing on wall face unplasticised Rigid PVC soil, waste & vent pipes (working pressure 6 kg / cm2) conforming to IS : 13592 Type A including jointing with seal ring conforming to IS : 5382 leaving 10 mm gap for thermal expansion: (i) Single socketed pipe - 110 mm OD

Providing and fixing M.S. stays and clamps for sand cast iron/centrifugally cast (spun) iron pipes of diameter : (i) 100 mm

Providing and fixing on wall face unplasticised - PVC moulded fittings/ accessories for unplasticised Rigid PVC soil, waste & vent pipes conforming to IS : 13592 Type A including jointing with seal ring conforming to IS : 5382 leaving 10 mm gap for thermal expansion: (a) Coupler (i) 110 mm

b) Bend 87.5° (i) 110mm

c) Single equal tee without door (i) 110x110x110mm

d) Single equal tee with door (i) 110x110x110mm

e) Double equal junction of required degree without door (i) 110x110x110 x110 mm

f) Double equal junction of required degree with door (i) 110x110x110 x110 mm

g) Terminal guard (i) 110 mm

Cutting chases in brick masonry walls for following diameter sand cast iron/centrifugally cast (spun) iron pipes and making good the same with cement concrete 1:3:6 ( 1 cement : 3 coarse sand :6 graded stone aggregate 12.5 mm nominal size ) including necessary plaster and pointing in cement mortar 1:4(1cement: 4 coarse sand): (i) 100 mm dia

Providing and filling the joints with spun yarn cement slurry and cement mortar 1:2 (1 cement: 2 fine sand) in S.C.I./C.I. Pipes: (i) 100 mm dia pipe

Providing and fixing Chlorinated Polyvinyl Chloride (CPVC) pipes, having thermal stability for hot & cold water supply including all CPVC plain & brass threaded fittings i/c fixing the pipe with clamps at 1.00 m spacing. This includes jointing of pipes & fittings with one step CPVC solvent cement and the cost of cutting chases and making good the same including testing of joints complete as per direction of Engineer in Charge. Concealed work including cutting chases and making good the walls etc. (i) 15 mm nominal outer dia Pipes.

ii) 20 mm nominal outer dia Pipes.

Providing and fixing Chlorinated Polyvinyl Chloride (CPVC) pipes, having thermal stability for hot & cold water supply including all CPVC plain & brass threaded fittings including fixing the pipe with clamps at 1.00 m spacing. This includes jointing of pipes & fittings with one step CPVC solvent cement and testing of joints complete as per direction of Engineer in Charge. Internal work - Exposed on wall (i) 25 mm nominal outer dia Pipes.

ii) 40 mm nominal outer dia .Pipes.

Providing and fixing Chlorinated Polyvinyl Chloride (CPVC) pipes, having thermal stability for hot & cold water supply including all CPVC plain & brass threaded fittings This includes jointing of pipes & fittings with one step CPVC solvent cement trenching ,refilling & testing of joints complete as per direction of Engineer in Charge. External work. 25 mm nominal outer dia Pipes.

ii) 40 mm nominal outer dia .Pipes.

Providing and fixing C.P. brass bib cock of approved quality conforming to IS:8931 (i) 15 mm dia nominal bore

Providing and fixing C.P. brass stop cock (concealed) of standard design and of approved make conforming to IS:8931. (i) 15 mm dia nominal bore

Providing and fixing gun metal gate valve with C.I. wheel of approved quality (screwed end): (i) 25 mm nominal bore

ii) 40 mm nominal bore

Providing and fixing gun metal non-return valve of approved quality (screwed end): (a) 25 mm nominal bore (i) Vertical

b) 40 mm nominal bore (i) Vertical

Providing and fixing C.P. brass angle valve for basin mixer and geyser points of approved quality conforming to IS:8931 (i) 15 mm dia nominal bore

Providing and fixing unplasticised PVC connection pipe with brass unions : (a) 45 cm length (i) 15 mm nominal bore

Providing and placing on terrace (at all floor levels) polyethylene water storage tank ISI : 12701 marked with cover and suitable locking arrangement and making necessary holes for inlet, outlet and overflow pipes but without fittings and the base support for tank.

Constructing brick masonry chamber for underground C.I. inspection chamber and bends with 1st class bricks in cement mortar 1:4 (1 cement : 4 fine sand) C.I. cover with frame (light duty) 455x610 mm internal dimensions, total weight of cover with frame to be not less than 38 kg (weight of cover 23 kg and weight of frame 15 kg) R.C.C. top slab with 1:2:4 mix (1 cement :2 fine sand : 4 graded stone aggregate 20 mm nominal size) foundation concrete 1:5:10 (1 cement: 5 fine sand : 10 graded stone aggregate 40 mm nominal size), inside plastering 12 mm thick with cement mortar 1:3 (1 cement: 3 fine sand) finished smooth with a floating coat of neat cement on walls and bed concrete etc. complete as per standard design : (i) Inside dimensions 500x700 mm and 45 cm deep for pipe line with one or two inlets :

Constructing masonry Chamber 30x30x50 cm, inside, in brick work in cement mortar 1:4 (1 cement :4 fine sand) for stop cock, with C. I. surface box 100x100 x75 mm (inside) with hinged cover fixed in cement concrete slab 1:2:4 mix (1 cement :2 coarse sand : 4 graded stone aggregate 20 mm nominal size ) necessary excavation foundation concrete 1:5:10 ( 1 cement :5 fine sand:10 graded stone aggregate 40mm nominal size ) and inside plastering with cement mortar 1:3 (1 cement :3 coarse sand) 12mm thick finished with a floating coat of neat cement complete as per standard design : (i) With Second Class bricks

Making soak pit 2.5 m diameter 3.0 metre deep with 45 x 45 cm dry brick honey comb shaft with well burnt 2nd class bricks and S.W. drain pipe 100 mm diameter, 1.8 m long complete as per standard design.

Constructing soak pit 1.20 x 1.20 x 1.20 m filled with brickbats including S.W. drain pipe 100 mm diameter and 1.20 m long complete as per standard design.

Providing, laying and jointing glazed stoneware pipes grade ‘A’ with stiff mixture of cement mortar in the of 1:1 (1 cement: 1 fine sand) including testing of joints etc. complete : (i) 100 mm diameter

Providing and laying cement concrete 1:5:10 (1 cement : 5 fine sand : 10 graded stone aggregate 40 mm nominal size) alround S.W. pipes including bed concrete as per standard design: (i) 100 mm diameter S. W. pipe

Providing and fixing on wall face unplasticised Rigid PVC rain water pipes (working pressure 4 kg/cm2) conforming to IS : 13592 Type A including jointing with seal ring conforming to IS : 5382 leaving 10 mm gap for thermal expansion etc. complete as per direction of Engineer-in-charge : (i) Single socketed pipe - 110 mm OD

Providing and fixing on wall face unplasticised - PVC moulded fittings/ accessories for unplasticised Rigid PVC rain water pipes conforming to IS : 13592 Type-A including jointing with seal ring conforming to IS : 5382 leaving 10 mm gap for thermal expansion etc. complete as per direction of Engineer-in-charge : (a) Coupler (i) 110 mm

b) Bend 87.5° (i) 110 mm

c) Single equal tee without door (i) 110x110x110mm

d) Single equal tee with door (i) 110x110x110mm

Providing and fixing 25mm x 1.40 mm clips made out of aluminium strip of approved design to unplasticised - PVC rain water pipes by means of Plastic Wall Plugs fitted in the brick work/R.C.C work by drilling with the help of mechaine and screwed with M.S. screws of required length and making good the wall etc. complete as per direction of Engineer-in-charge. (i) 110 mm

Providing and fixing to the inlet mouth of rain water pipe PTMT grating with thickness of 8mm and weighing not less than 100gm. etc. complete as per direction of Engineer-in-charge. (i) 100 mm

Painting on rain water, soil, waste and vent pipes and fittings with synthetic enamel paint ( two or more coats ) of required colour of approved brand and manufacture to give an even shade on new work over and including a priming coat of approved steel primer complete. (i) 100 mm. dia.

(G) S.H. WATER PROOFING & REHABILITATION WORK Grading roof for water proofing treatment complete as required as per direction of the Engineer-in-charge with : (i) Cement concrete 1:2:4 (1 cement : 2 fine sand : 4 graded stone aggregate 20 mm nominal size)

Providing, mixing and applying bonding coat of approved adhesive on chipped portion of RCC as per specifications and as per direction of Engineer-In-charge complete in all respect. (i) SBR Polymer (@10% of cement weight) modified cementitious bond coat @2.2 kg cement per sqm of surface area mixed with specified proportion of approved polymer

Extra for providing and mixing water proofing material in cement concrete work in doses by weight of cement as per manufacturer's specification

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