INDEX OF INVENTIONS Letters Patent of the United States were Granted in the Week Ending May 20 1879 AND EACH BEARING THAT DATE. English Patents Issued to Americans., scientific american, 1879-06-11
INDEX OF INVENTIONS Letters Patent of the United States were Granted in the Week Ending May 20 1879 AND EACH BEARING THAT DATE. English Patents Issued to Americans., scientific american, 1879-06-11
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