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| All Patents in class 73/333 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 391,012 | Oct. 16, 1888 | J.G. Blount | Safety water-gage | ||
| 401,326 | Apr. 16, 1889 | J.G. Blount | Water-gage | ||
 | 529,560 | Nov. 20, 1894 | J.A. Milliken | Water-gage | |
| 705,113 | Jul. 22, 1902 | J.A. Mosher | Safety Device for Water Gages | ||
| 837,790 | Dec. 04, 1906 | W.E. Bryant | Automatic Checks for Feed Glasses and Water by Passes for Lubricators | ||
| 1,147,835 | Jul. 27, 1915 | R. Wood | Low Water Alarm for Steam Boilers and the Like | ||