Door operating apparatus
United States Patent 1929273

Inventors:
Crago, Harry R.
Publication Date:
10/03/1933
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Assignee:
GEN ELECTRIC
Primary Class:
49/25
Other Classes:
361/167, 361/186, 361/176, 318/480, 74/612, 250/221, 361/168.100, 250/208.400, 38/1C
International Classes:
E05F15/20