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| All Patents in class 137/883 | |||||
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| Number | Date | Patentee | Title | Type | |
| 391,012 | Oct. 16, 1888 | J.G. Blount | Safety water-gage | boiler water gauges | |
| 3,039,489 | Jun. 19, 1962 | L.A. Botkin | Valve structure | ||