Category:1907 patents
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This category has the following 2 subcategories, out of 2 total.
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- Kamenoko-tawashi (1 F)
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Media in category "1907 patents"
The following 3 files are in this category, out of 3 total.
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Canadian Patent Document 111247.jpg 487 × 727; 109 KB
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Edisonfluorescent.jpeg 1,536 × 1,114; 168 KB
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Patent Drawing for H. R. Cool's Electrotherapeutic Syringe - NARA - 7369164 (page 2).pdf 1,518 × 2,254; 578 KB