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| All Patents in class 251/273 | |||||
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| Number | Date | Patentee | Title | Type | |
| 923,524 | Jun. 01, 1909 | F.G. Hobart | Valve for gas-engines | internal combustion engine valves | |
| 1,680,876 | Aug. 14, 1928 | A.O. Guerris | Bottle-dispensing device | champagne and soda tools | |
| 3,103,827 | Sep. 17, 1963 | N.R. Logan | Dual Operator for Slides | metalworking machines | |