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| All Patents in class 261/DIG.53 | |||||
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| Number | Date | Patentee | Title | Type | |
| 787,422 | Apr. 18, 1905 | F.L. Wolfe | Whistle Valve | steam valves | |
| 1,395,950 | Nov. 01, 1921 | W.J. En Earl | Vacuum Carbureter | carburetors | |