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| All Patents in class 184/30 | |||||
| Number | Date | Patentee | Title | Type | |
| 333,404 | Dec. 29, 1885 | J.E. Fletcher | Automatic Lubricator | oil cups | |
| 2,007,140 | Jul. 02, 1935 | E.R. Gradhe | Pump Mechanism | oil pumps | |