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| All Patents in class 222/250 | |||||
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| Number | Date | Patentee | Title | Type | |
| 700,644 | May 20, 1902 | J. Hartness | Fluid Regulating Device | hydraulic apparatus | |
| 700,645 | May 20, 1902 | J. Hartness | Fluid Regulating Device | hydraulic apparatus | |
| 703,410 | Jul. 01, 1902 | J. Hartness | Fluid Regulating Device | hydraulic apparatus | |
| 920,769 | May 04, 1909 | C.W. Manzel | Lubricator | tool lubricators | |
| 1,841,526 | Jan. 19, 1932 | R.E. Flanders | Metering Device | hydraulic apparatus | |