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All Patents in class 236/63
Patents 1 - 2 of 2
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

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