United States Patent 3218219
Inventors:
Sherman, Robert A.
Publication Date:
11/16/1965
Other Classes:
425/369, 425/162, 242/418.100, 425/107, 226/44, 318/6
International Classes:
B31F1/28; B31F7/00; H02P7/34; B31F1/20; H02P7/18
US Patent References:
| 3032245 | Apparatus for controlling web tension | | | |