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| All Patents in class 73/738 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,416,794 | May 23, 1922 | A.E. Cutler | Pressure gauge | ||
| 3,141,335 | Jul. 21, 1964 | N.J. Smith | Pressure relief means for gauges | vacuum and pressure gauges | |