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Recently Patented Inventions - May 10, 1919

Brief Descriptions of Recently Patented Mechanical and Elecitrcal Devices, Tools, Farm Implements, Etc.

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Scientific American Magazine Vol 120 Issue 19This article was originally published with the title “Recently Patented Inventions” in Scientific American Magazine Vol. 120 No. 19 (), p. 494
doi:10.1038/scientificamerican05101919-494