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| All Patents in class 137/102 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,224,272 | May 01, 1917 | W.H. Callan | Unloader for Air Compressors | air compressors | |
| 1,806,301 | May 19, 1931 | J.L. Valley | Pressure controlled valve | pressure regulators | |