COMMUNICATIONS RECEIVED. ceipt of original papers and contributions upon the following subjects : Index of Inventions Letters Patens of the United States November 25 1873 EXTENSIONS GRANTED. SCHEDULE OF PATENT FEES. CANADIAN PATENTS. 0W TO OBTAIN Paints alld Caveats IN CANADA. MUNN & CO. 37 Park Row New York. And How to Obtain Them., scientific american, 1873-12-11
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