All sizes in. Shall and up. 10 eta. in Stamps Mr samples. PRESSED STEEL MFG. CO. 545 The Bourse. Phila„ Pa. pATENTS TRADE MARKS DESIGNS COPYRIGHTS &C. invention is probably patentable. Communica Scientific Anerican BRIDGEPORT CONN. Specialties & Patents Bought_andSold How to Construct An Independent Interrupter York. going list. For terms and further particulars, scientific american, 1906-12-29

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