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| All Patents in class 137/516.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,470,625 | Oct. 16, 1923 | J.W. Jones | Plate valve | air compressors | |
| 1,708,158 | Apr. 09, 1929 | E.H. Stedman | Valve structure for compressors | air compressors | |