United States Patent 3073431
Inventors:
Davis, Richmond L.
Williams, William C.
Hanner, James L.
Publication Date:
01/15/1963
Assignee:
UNITED CARBON COMPANY INC
Other Classes:
312/125, 414/790.400, 414/930, 108/94, 211/131.100
International Classes:
B65G57/00