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Scientific American, Vol. 34, No. 13 (March 1876) (1876)

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An illustration from Scientific American, Vol. 34, No. 13 (March 1876), 1876, leaf 0
rom any of our readers who may the drill is secured from dropping out of the holder. part of the invention is applicable to all drilling machines, test the suggestion. Meanwhile we shall experiment for The drilling tools. A, are secured in the sockets of the and forms a very efScient way of driving… … MULTIPLE DEILLIHO MACHDTE- © 1876 SCIENTIFIC AMERICAN, INC.

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