All Patents in class 137/402


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All Patents in class 137/402
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
2,019,461	Oct. 29, 1935	P.S. Russel	Control Means	flow controls
2,416,267	Feb. 18, 1947	W.S. Landon	Automatic Orifice Cleaning Device	pipe and orifice cleaners