United States Patent 3486489
Inventors:
Huggins, Homer D.
Publication Date:
12/30/1969
Other Classes:
165/140, 165/177, 123/196R, 165/183, 165/916, 165/164, 165/169
International Classes:
F28D1/053; F28D7/02; F28F1/02; F28F9/02; F28D1/04; F28D7/00; F01P11/08