APRIL 30 1881 COMMUNICATIONS RECEIVED. INDEX OF INVENTIONS SOB WHICH Letters Patent of the United States were Granted in the Week Ending March 29 1881 AND EACH REARING THAT DATE. English Patents Issued to Americans., scientific american, 1881-04-30
APRIL 30 1881 COMMUNICATIONS RECEIVED. INDEX OF INVENTIONS SOB WHICH Letters Patent of the United States were Granted in the Week Ending March 29 1881 AND EACH REARING THAT DATE. English Patents Issued to Americans., scientific american, 1881-04-30
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