United States Patent 3504866
Inventors:
Palynchuk, Alexander
Paplinski, Walter
Publication Date:
04/07/1970
Other Classes:
242/559.100, 242/403, 242/407
International Classes:
B65H49/38; B65H75/36; E21B19/22; B65H49/00; B65H75/34; E21B19/00; B65H75/40