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| Patents for Frank H. Mason | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 500,286 | Jun. 27, 1893 | W. Lewis | Bending-roll | |
 | 513,261 | Jan. 23, 1894 | M. Jaeger | Vise | |
 | 587,637 | Aug. 03, 1897 | E. Bausch | Prism gage | |