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Scientific American, Vol. 42, No. 26 (1880) (1880)
leaf 3
l, when the boats are floated out exit and entrance ports of the pump and with the radial of the caissons, float slots of the revolving cylinder. An improved rock drill has been patented by Mr. George rt te P. Schaurer, of Nashville, Tenn. The object of this inven- A CORRESPONDENT, writing from… … © 1880 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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