Revolving door
United States Patent 2523980
US Patent References:
/0656062.html
- - 0656062

/1030266.html
- - 1030266


Inventors:
Carter, Whiteford Frederick
Publication Date:
09/26/1950
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Assignee:
Carter, Whiteford Frederick
Primary Class:
49/44
International Classes:
E06B3/90