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| All Patents in class 137/201 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,167,433 | Jul. 25, 1939 | G.B. Duffield | Air Vent Valve | valves | |
| 2,284,137 | May 26, 1942 | L.W. Eggleston | Air Vent Valve | valves | |