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Scientific American, Vol. 13, No. 6 (1865) (1865)
leaf 9
Ghe Srientitic ‘ … slider, u, the brush lever, r, and its pressure spring, t, and the cam and Allen Lapham, Brooklyn, N. Y.: med lever, 4, the whole being arranged and sv as to operate together, We claim, First, The elevated exit chamber, ©, in combination substantially as specified. with the chimney or flue, B.…Internet Archive · Public domain (published before 1931). Free to use for anything.
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