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| All Patents in class 277/520 | |||||
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| Number | Date | Patentee | Title | Type | |
| 403,408 | May 14, 1889 | C.E. Baker, T.J. Baker | Combined Wrench and Piston Lubricator | wrenches | |
| 490,107 | Jan. 17, 1893 | R.G. Ferguson | Packing | auxiliary wrenches | |
| 1,530,505 | Mar. 24, 1925 | A. Levedahl | Stuffing box | ||
| 1,798,158 | Mar. 31, 1931 | W.H. Hazard | Stuffing Box | pump stuffing boxes and seals | |
| 2,045,024 | Jun. 23, 1936 | F.P. Thieman, H.J. Renken | Pump | piston pumps | |
| 2,605,748 | Aug. 05, 1952 | J.E. Rasoletti | Adjustable abutment for pistons | drill presses | |