Category:1906 patents
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Media in category "1906 patents"
The following 3 files are in this category, out of 3 total.
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Patenturkunde Karl Spitzenberg Russland 1906 Cropped.jpg 2,156 × 3,286; 5.63 MB
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Patenturkunde Karl Spitzenberg Russland 1906.jpg 2,592 × 3,872; 1.75 MB
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Wright-Patent-US-821393.pdf 1,158 × 1,702, 10 pages; 947 KB