All Patents in class 209/273


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All Patents in class 209/273
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
7,941X	Dec. 31, 1833	S.A. Sweet	Pulp Sifter
6,902	Nov. 27, 1849	S. Hughes, C. Learned	Improvement in machinery for dressing flour
2,161,989	Jun. 13, 1939	D.M. Waterous	Screening paper pulp	paper making machines