COMMUNICATIONS RECEIVED. INDEX OF INVENTIONS Letters Patent of the United States were Granted in the Week Ending August 22 1876 DESIGNS PATENTED. SCHEDULE OF PATENT FEES. $20 820 $30 5 $30 THE VALIDITY OF PATENTS. Inside Page each insertion - 75 cents a line. Back Page each insertion - a line. SCIENTIFIC BOOKS. Pocket -Book of Useful Formula and, scientific american, 1876-09-23

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COMMUNICATIONS RECEIVED. INDEX OF INVENTIONS Letters Patent of the United States were Granted in the Week Ending August 22 1876 DESIGNS PATENTED. SCHEDULE OF PATENT FEES. $20 820 $30 5 $30 THE VALIDITY OF PATENTS. Inside Page each insertion - 75 cents a line. Back Page each insertion - a line. SCIENTIFIC BOOKS. Pocket -Book of Useful Formula and, scientific american, 1876-09-23

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