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| All Patents in class 73/741 | |||||
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| Number | Date | Patentee | Title | Type | |
| 829,551 | Aug. 28, 1906 | G. Spencer | Pressure Gage | vacuum and pressure gauges | |
| 1,238,109 | Aug. 28, 1917 | A.B. Collette | Gage Spring | vacuum and pressure gauges | |
| 2,040,681 | May 12, 1936 | H.S. Baker | Gauge | vacuum and pressure gauges | |
| 2,239,938 | Apr. 29, 1941 | N.J. Smith | Tube Support for Gauges, Recorders, and the Like | industrial recording apparatus | |
| 3,196,688 | Jul. 27, 1965 | N.J. Smith | Bleeder means for gauges | vacuum and pressure gauges | |