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| All Patents in class 417/250 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 12,723 | Apr. 17, 1855 | D. Fowler | Machine for Punching Metal | |
 | 863,115 | Aug. 13, 1907 | R.D. Tomlinson | Condenser | |
| 1,297,035 | Mar. 11, 1919 | J.M. Stratton | Pump | ||