Title:
Vault protective system
United States Patent 2081271
Inventors:
Ellithorpe, Clarence D.
Publication Date:
05/25/1937
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Export Citation:
Assignee:
DUPLEX ELECTRIC COMPANY
Primary Class:
Other Classes:
109/38, 109/9, 70/277, 109/59R, 70/284
International Classes:
E05G5/00