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| All Patents in class 251/264 | |||||
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| Number | Date | Patentee | Title | Type | |
| 164,867 | Jun. 22, 1875 | J. Norton | Combined Wrench and Oiler | wrench combination tools | |
| 1,569,674 | Jan. 12, 1926 | R.J. Pigott | Valve | industrial valves | |
| 2,348,412 | May 09, 1944 | E.M. Pfauser | Pump Assemblage | hand pumps | |
| 2,403,427 | Jul. 02, 1946 | O.H. Ludeman | Valve Mechanism | steam valves | |
| 2,451,799 | Oct. 19, 1948 | W.R. Brown | Valve Structure | metalworking machine vises | |