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All Patents of Type: boiler level gauges | |||||
Number | Date | Patentee | Title | Type | |
138,524 | May 06, 1873 | A.P. Pitkin | Water Indicator for Steam Boilers | boiler level gauges | |
925,361 | Jun. 15, 1909 | L.D. Lovekin | Level Indicating Gage | boiler level gauges |