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| All Patents in class 184/6.28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,825,318 | Sep. 29, 1931 | L.B. Kapp | Pump | internal combustion engine lubrication | |
| 2,013,478 | Sep. 03, 1935 | E.C. Read | Lubricating system | ||