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| All Patents in class 184/33 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,436,492 | Feb. 24, 1948 | R.H. Shepard | Pumping Units for Mechanical Lubricators | industrial machine lubrication | |
| 2,523,653 | Sep. 26, 1950 | C.F. Erikson | Force Feed Lubrication | industrial machine lubrication | |