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| All Patents in class 222/474 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,241,511 | Oct. 02, 1917 | A.L. Hansen | Safety Oil Can | oil cans | |
| 1,883,282 | Oct. 18, 1932 | O.U. Zerk | Lubicating Apparatus | ||
| 2,299,492 | Oct. 20, 1942 | E.M. Pfauser | Pump Assembly | hydraulic pumps | |