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| All Patents in class 73/332 | |||||
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| Number | Date | Patentee | Title | Type | |
| 138,524 | May 06, 1873 | A.P. Pitkin | Water Indicator for Steam Boilers | boiler level gauges | |
| 278,223 | May 22, 1883 | W.A. Clarke | Water-gage | gauges | |