Category:1925 patents
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Media in category "1925 patents"
The following 5 files are in this category, out of 5 total.
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Clarke 1.pdf 1,275 × 1,650; 95 KB
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EdithClarkeCalculatorUSPatentDrawing.pdf 1,239 × 1,754; 96 KB
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EdithClarkeCalculatorUSPatentDrawing.png 608 × 912; 212 KB
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Ruckstell axle-page-001.jpg 2,550 × 3,300; 987 KB
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Ruckstell axle.pdf 1,275 × 1,650, 4 pages; 359 KB