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Wheel and Pinion Cutting in Horology: A Historical Guide by J. Malcolm Wild (Hardcover - Sep 1, 2001)

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Excerpt - page 34: "... a segment of a gear operating a rack; the actual wheel count is achieved by two ratchet wheels. There is a complete set of ratchet wheels supplied ..."

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3 Pc Set Thumb Wheel Ratchet Wrench 1/2 1/4 3/8 Drive by Pittsburgh

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Tool Wrench Pedros Ratchet Combo 8mm by Pedros

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Olfa #5003 Heavy Duty Cutter/Ratchet Wheel by Olfa

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Apollo Safety Belt With Ratchet by Apollo

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