Title:
BRIDGE FAILURE WARNING DEVICE
United States Patent 3522790

Inventors:
Cambre, Robert J.
Valley, Vincent R.
Publication Date:
08/04/1970
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Assignee:
BOH BROS CONSTRUCTION CO INC
Primary Class:
116/215
Other Classes:
116/4, 116/212, 246/486, 102/343
International Classes:
G08B21/10; G08B21/00; G08B5/40; G08B21/00




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