Title:
Process and apparatus for grading finely divided material
United States Patent 1959212


Inventors:
Miller, Robert A.
Application Number:
US57554531A
Publication Date:
05/15/1934
Filing Date:
11/17/1931
Assignee:
PITTSBURGH PLATE GLASS CO
Primary Class:
Other Classes:
209/158, 209/208
International Classes:
B03B5/62
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