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Practical treatise on gearing (1892)
Beale, Oscar James, Brown & Sharpe Manufacturing Company (Providence, R.I.) · Providence, R.I. : Brown & Sharpe Mfg. Co. · leaf 76
Pig, 35.Worm and ^A^orm-Wheel, for Gear-cutting Engine. PROVIDENCE, R. I. 57 ^^::Gearing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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