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| All Patents in class 340/404.3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 787,422 | Apr. 18, 1905 | F.L. Wolfe | Whistle Valve | steam valves | |
| 873,822 | Dec. 17, 1907 | F.L. Wolfe | Whistle Valve | gas and liquid valves | |