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| All Patents in class 417/176 | |||||
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| Number | Date | Patentee | Title | Type | |
| 536,415 | Mar. 26, 1895 | J.L. Bogert | Vacuum-pump | ||
| 616,539 | Dec. 27, 1898 | L. Kaczander | Boiler Tester | boiler washout apparatus | |