OFFICIAL. English Patents Issued to Americans. THIRTY-THIRD YEAR. 51 Numbers a Year. . 37 Park Row New York. ron winci5 Letters Patent 05' the United States were Granted in the Week Ending May 21 1878 AND BEARING THAT DATE. INDEX OF INVENTIONS, scientific american, 1878-08-03
OFFICIAL. English Patents Issued to Americans. THIRTY-THIRD YEAR. 51 Numbers a Year. . 37 Park Row New York. ron winci5 Letters Patent 05' the United States were Granted in the Week Ending May 21 1878 AND BEARING THAT DATE. INDEX OF INVENTIONS, scientific american, 1878-08-03
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