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| All Patents in class 236/61 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,208,181 | Jul. 16, 1940 | L.W. Eggleston | Vacuum Air Valve | valves | |
| 2,281,566 | May 05, 1942 | L.W. Eggleston | Air Vent Valve | valves | |