United States Patent 2194113
Inventors:
Covell, Harold S.
Heasley, Loyd E.
Cole, Nelson E.
Publication Date:
03/19/1940
Assignee:
HART & COOLEY MFG COMPANY
Other Classes:
55/DIG.031, 220/361, 454/309, 256/21, 256/24
International Classes:
E06B9/01; F24F13/075; F24F13/06