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| All Patents in class 141/311R | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,459,662 | Jun. 19, 1923 | C.W. Manzel | Lubricating System | ||
| 1,475,980 | Dec. 04, 1923 | O. Zerk | Lubricating Apparatus | grease guns | |
| 1,620,824 | Mar. 15, 1927 | C.W. Manzel | Lubricating Gun | ||