United States Patent 2500815
Inventors:
Gerli, David C.
Dawson, Edward G.
Publication Date:
03/14/1950
Other Classes:
212/299, 52/114, 212/247, 52/117, 414/917, 212/280, 182/112, 212/285
International Classes:
B66F11/04; E02F3/42; E02F9/12; E06C5/02; E02F9/08; E06C5/00