71573904
Feb 15, 1949
Sep 25, 1951
VIBRATING CONVEYORS FOR CONVEYING GRAIN, COAL,SAND, AND POWDERED MATERIALS; GYRATORY SCREENS FOR SCREENING SAND, GRAVEL, COAL, AND OTHER FRAGMENTARY MATERIALS; ALSO SHAKE-OUTS FOR SEPARATING AND SHAKING SAND OUT OF CASTINGS OF ALL KINDS
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