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| All Patents in class 137/519 | |||||
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| Number | Date | Patentee | Title | Type | |
| 20,919 | Jul. 13, 1858 | B. Holly | Damper | stove pipes | |
| 555,664 | Mar. 03, 1896 | G.H. Schrader | Valve and stopper | valves | |
| 3,610,274 | Oct. 05, 1971 | A. Hirt, G.N. Levesque | Fluid Logic Circuit | ||