INDEX OF INVENTIONS Letters Patent of the United States were Granted in the Week Ending April 6 1880 AND EACH BEARING THAT DATE. English Patents Issued to Americans., scientific american, 1880-05-08
INDEX OF INVENTIONS Letters Patent of the United States were Granted in the Week Ending April 6 1880 AND EACH BEARING THAT DATE. English Patents Issued to Americans., scientific american, 1880-05-08
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