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| All Patents in class 261/114.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 44,561 | Oct. 04, 1864 | E.R. Stilwell | Improvement in feed-water heaters and filters | feedwater apparatus | |
| 825,831 | Jul. 10, 1906 | C.L. Heisler | Condenser | steam condensers | |