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Scientific American, Vol. 62, No. 21 (1890) (1890)
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ward introducing mechanism at once strong, light, replaced by a leaf spring secured to the retractor box. thereby pulling the block to the rear into the tray, N, safe, and simple, Lieutenant Samuel Seabury, of the This renders unnecessary having so large a hole drilled through the slipper guide… … © 1890 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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