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| All Patents in class 137/112 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,693,109 | Nov. 27, 1928 | W. Ernst | Semiautomatic Valve | hydraulic valves | |
| 2,705,501 | Apr. 05, 1955 | R.C. Fritzsch | Non-repeat valve | sheet metal brakes | |