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| All Patents in class 73/700 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 764,016 | Jul. 05, 1904 | G. Spencer | Pressure Gage | ||
 | 1,272,856 | Jul. 16, 1918 | K. Rushton | Gage | |
 | 3,196,688 | Jul. 27, 1965 | N.J. Smith | Bleeder means for gauges | |