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OCR: " h.p. motor 1,750 r.p.m. Choice of pulley sizes deter- mines crank speed, +0:1 reducing soaped wooder gear guides for recipro- cating plate universal joint plastic-disk crank with holes different radi 3/8 brass con- necting rods plastic wave Paddle sides back and bottom mar ine wood front lasti water with joints cavlked rein forcing brackets aqvarium ement Wooden radii marime plywood caulked ckets cement