Title:
Safety apparatus
Document Type and Number:
United States Patent 2797853

Inventors:
Frank, James
Publication Date:
07/02/1957
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Assignee:
Frank, James
Primary Class:
182/137
International Classes:
A62B1/22; A62B1/00
US Patent References:
0367362
0396242
1576269Check valve
1594317Elevator
2390955Fire escape


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