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All Patents in class 137/201
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
2,167,433Jul. 25, 1939G.B. DuffieldAir Vent Valvevalves
2,284,137May 26, 1942L.W. EgglestonAir Vent Valvevalves
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