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| All Patents in class 73/326 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,371X | Mar. 24, 1826 | W. Barker | Gauge sight for steam boilers | stationary boilers | |
| 529,560 | Nov. 20, 1894 | J.A. Milliken | Water-gage | boiler water gauges | |
| 705,113 | Jul. 22, 1902 | J.A. Mosher | Safety Device for Water Gages | liquid gauges | |
| 1,021,255 | Mar. 26, 1912 | E. McCoy | Gage | steam engine lubricators | |
| 1,602,064 | Oct. 05, 1926 | W.O. Ashe | Water Gauge | boiler water gauges | |