COMMUNICATIONS RECEIVED. INDEX OF INVENTIONS FOB WHICH Letters Patent of the United States were Granted in the Week ending March 16 1875 AND EACH BEARING THAT DATE. SCHEDULE OF PATENT FEES. S10 S13 S20 $10 $20 830 0 810 CANADIAN PATENTS. Back Page 81.00 a line. Inside Page 75 cents a line. Machinist's Tools., scientific american, 1875-04-17
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