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| All Patents in class 200/81.6 | |||||
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| Number | Date | Patentee | Title | Type | |
| 785,438 | Mar. 21, 1905 | C.E. Sargent | Pressure Gage | vacuum and pressure gauges | |
| 2,225,190 | Dec. 17, 1940 | I.A. Weaver, C.H. Phelps | Fluid-operated electric switch | electric switches | |
| RE22,012 | Jan. 20, 1942 | I.A. Weaver, C.H. Phelps | Fluid-operated electric switch | electric switches | |