Category:1919 patents
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Media in category "1919 patents"
The following 2 files are in this category, out of 2 total.
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Continuous casting van Ranst patent US1385595.png 1,650 × 1,848; 60 KB
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US1295691A, Thaddeus Cahill, Art of and Apparatus for Generating and Distributing Music Electrically, filed 1915, issued 1919.pdf 1,158 × 1,702, 141 pages; 13.73 MB