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| All Patents in class 137/601.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 588,779 | Aug. 24, 1897 | J.M. Rauhoff | Check-valve | ||
| 2,417,217 | Mar. 11, 1947 | H. Schreck | Fluid Flow Control Device | hydraulic machinery | |