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| All Patents in class 137/419 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,080,507 | Dec. 02, 1913 | J.B. Armstrong | Trap-Valve Mechanism | steam and water separators | |
| 2,110,100 | Mar. 01, 1938 | A. Von Wangenheim | Gravity Feed Control | flow controls | |