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| All Patents in class 346/36 | |||||
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| Number | Date | Patentee | Title | Type | |
| 873,822 | Dec. 17, 1907 | F.L. Wolfe | Whistle Valve | valves | |
| 1,182,133 | May 09, 1916 | A.O. Benecke | Time Controlling and Recording Mechanism | industrial recording apparatus | |