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| All Patents in class 251/363 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,341,701 | Jun. 01, 1920 | G.D. Alexander | Power-driven tool-driver | handheld power tools | |
| 2,446,274 | Aug. 03, 1948 | J.N. Gladden | Valve | internal combustion engine valves | |
| 3,042,068 | Jul. 03, 1962 | R.V. Smith | Safety relief valve | pressure regulators | |