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| All Patents in class 55/407 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,101,493 | Jun. 23, 1914 | C.R. Houghton | Combination-pump | water pumps | |
| 1,232,464 | Jul. 03, 1917 | C.R. Houghton | Dust-separator | dust collectors | |