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| Patents for Oscar Zerk | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,175,496 | Mar. 14, 1916 | O. Zerk | Lubricating-bolt | |
| 1,252,763 | Jan. 08, 1918 | G.W. Drake, O. Zerk | Thread Milling Machine | ||
| 1,265,861 | May 14, 1918 | O. Zerk | Grease Cup | ||
 | 1,475,980 | Dec. 04, 1923 | O. Zerk | Lubricating Apparatus | |