All Patents in class 422/146


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All Patents in class 422/146
Patents 1 - 1 of 1
Number	Date	Patentee	Title	Type
2,451,804	Oct. 19, 1948	D.L. Campbell, H.Z. Martin, E.V. Murphree, C.W. Tyson	Method of and apparatus for contacting solids and gases