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| All Patents in class 73/708 | |||||
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| Number | Date | Patentee | Title | Type | |
| 549,700 | Nov. 12, 1895 | J.H. Millett, C.B. Bosworth | Steam-gage | steam pressure gauges | |
| 1,404,771 | Jan. 31, 1922 | F.H. Hopkins | Compensating Thermometer | temperature gauges | |