RECENTLY PATENTED INVENTIONS. Electrical Devices. Of General Interest. Machines and Mechanical Devices. Prime Movers and Their Accessories. NEW BOORS ETC. INDEX OF INVENTIONS For which Letters Patent of the United States were Issued for the Week Ending August 20 1907. AND EACH BEARING THAT DATE, scientific american, 1907-08-11
RECENTLY PATENTED INVENTIONS. Electrical Devices. Of General Interest. Machines and Mechanical Devices. Prime Movers and Their Accessories. NEW BOORS ETC. INDEX OF INVENTIONS For which Letters Patent of the United States were Issued for the Week Ending August 20 1907. AND EACH BEARING THAT DATE, scientific american, 1907-08-11
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