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| All Patents in class 137/433 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 141,302 | Jul. 29, 1873 | C.J. Weld | Improvement in water-regulators for boilers | |
| 335,968 | Feb. 09, 1886 | A.A. Shobe | Feed Water Apparatus | ||