Title:
Roof jack for ventilating duct
Document Type and Number:
United States Patent 2741972
Inventors:
Ralph, Pryne
Plaque It!
Sponsored by: Flash of Genius |
Publication Date:
04/17/1956
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Referenced by:
Export Citation:
Assignee:
PRYNE & CO INC
Primary Class:
Other Classes:
454/366, 454/347, 454/363, D23/373, 454/904, 454/353
International Classes:
F23L17/02; F24F7/02; F23L17/00
US Patent References: