Category:1917 patents
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This category has only the following subcategory.
Media in category "1917 patents"
The following 2 files are in this category, out of 2 total.
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US1213803A, Thaddeus Cahill, Art of and Apparatus for Generating and Distributing Music Electrically, filed 1904, issued 1917.pdf 1,158 × 1,702, 45 pages; 5.23 MB
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US1213804A, Thaddeus Cahill, Art of and Apparatus for Generating and Distributing Music Electrically, filed 1915, issued 1917.pdf 1,158 × 1,702, 155 pages; 14.38 MB