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| All Patents in class 251/337 | |||||
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| Number | Date | Patentee | Title | Type | |
| 276,805 | May 01, 1883 | W.H. Guild | Pump Valve | pump valves | |
| 1,401,161 | Dec. 27, 1921 | G. Lidseen | Oil-Can Spout Closer | oil cans | |
| 2,027,579 | Jan. 14, 1936 | J. De Mooy | Exhaust Deflector | pneumatic tools | |
| 2,145,977 | Feb. 07, 1939 | B.N. Foster | Solenoid actuated valve | metalworking machine mechanisms | |
| 2,298,253 | Oct. 06, 1942 | W.E. Cowley, E.J. Dillman | Valve | valves | |
| 2,634,086 | Apr. 07, 1953 | W.E. Johns | Valve with self-contained stem centering device | ||