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| All Patents in class 73/709 | |||||
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| Number | Date | Patentee | Title | Type | |
| 129,958 | Jul. 30, 1872 | J.P. Holt | Improvement in Registering Steam-Gauges | steam pressure gauges | |
| 794,054 | Jul. 04, 1905 | G. Spencer | Pressure Gage | vacuum and pressure gauges | |
| 1,641,838 | Sep. 06, 1927 | H.J. Burkhardt | Pressure gauge | vacuum and pressure gauges | |