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| All Patents in class 417/174 | |||||
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| Number | Date | Patentee | Title | Type | |
| 37,542 | Jan. 27, 1863 | N. Cope | Improvement in Giffard's injector | feedwater apparatus | |
| 677,866 | Jul. 09, 1901 | W.T. Harris | Apparatus for Returning Exhaust Steam to Steam Boilers | steam pumps | |