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Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive vol. 2 H-P
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Bulletin - United States National Museum. Science. Figure 54.—1809: The introduction of the gimlet- pointed auger followed Ezra L'Hommedieu's patent of 1809. From this date until its general disuse in the
Index of patents issued from the United States Patent Office : United States. Patent Office : Free Download, Borrow, and Streaming : Internet Archive
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