Title:
Safety device for suspended doors
Document Type and Number:
United States Patent 1863961


Inventors:
Ball, Halleck C.
Jackson, Clayton R.
Keller, Walter B.
Winder, Joseph Z.
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Sponsored by:
Flash of Genius
Publication Date:
06/21/1932
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Assignee:
Richmond, Fireproof Door Compan
Primary Class:
160/189
Other Classes:
16/DIG.031, 160/201, 49/322
International Classes:
E05D13/00