Scientific American March 21, 1908. 212 … 881,171 Drum, rotating, R. F. Abbe Because of its smooth action, even balance and unfail- 881,438 Dumb bell for physical exercises, G. Nohl.. 881,307 Duplicating apparatus, stencil, A. B. Dick. ing constancy of power, Model G has many times proven Eyeglass Screwdriver Dust separator and collector,…
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