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| All Patents in class 73/327 | |||||
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| Number | Date | Patentee | Title | Type | |
| 470,858 | Mar. 15, 1892 | R. Klinger | Water-gage | boiler water gauges | |
| 925,361 | Jun. 15, 1909 | L.D. Lovekin | Level Indicating Gage | boiler level gauges | |
| 1,033,457 | Jul. 23, 1912 | P. Panhorst | Locomotive Lubricator | steam engine lubricators | |