Metallurgical apparatus
United States Patent 1528204

Inventors:
Greenawalt, William E.
Publication Date:
03/03/1925
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Assignee:
Greenawalt, William E.
Primary Class:
261/91
Other Classes:
261/DIG.072, 261/92, 261/98
International Classes:
C22B3/02; C22B3/00