Title:
Method and machine for making triple wall corrugated paper board
United States Patent 2759523
Inventors:
Samuel, Goldstein
Immanuel, Lichtenstein
Publication Date:
08/21/1956
Other Classes:
156/207, 493/335, 425/384, 229/5.810, 493/346, 493/403, 156/211, 229/939
International Classes:
B31F1/28; B31F1/20
US Patent References:
| 2485020 | Combined cutting and creasing dies for paper slotting machines | | | |