44 ofcientific American. Also enquiries and answers from the follow ing: [OFFICIAL.1 Index of Inventions Letters Patent of the United States APPLICATIONS FOR EXTENSIONS. EXTENSION GRANTED. DESIGNS PATENTED. TRADE MARKS REGISTERED. SCHEDULE OF PATENT FEES. CANADIAN PATENTS. Back Page 81.00 a Hue. lnidde Page 75 cent@ a line. ENGINES. SCREWS. BOILERS. . Boors ESTUD 1856. '.:--, scientific american, 1874-07-18
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