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| All Patents in class 251/200 | |||||
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| Number | Date | Patentee | Title | Type | |
| 955,334 | Apr. 19, 1910 | C.A. Hoefer | Valve Inserting Machine | valve inserting machines | |
| 1,476,862 | Dec. 11, 1923 | W. Strube, H. Wagner | Valve | valves | |