POND'S TOOLS,

Engine Lathes, Planers, Drills, &c.,

DAVID W. POND, Worcester, Mass.

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EDMUND DRAPER,

Manufacturer of First-class Engineers' Instruments.

Established in 1830. 226 Pear St., Phila., Pa.

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Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 135 / 162 题