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| All Patents in class 137/312 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,216,499 | Feb. 20, 1917 | A.J. Roeffs | Drip Connection for Fire-cocks, Hydrants, and the Like | hose couplings | |
| 1,954,192 | Apr. 10, 1934 | G.A. Biggs | Valve | water valves | |
| 1,997,890 | Apr. 16, 1935 | E.L. Wall | Universal Tracer | hydraulic apparatus | |