United States Patent 3208771
Inventors:
Sichel, Ramon Hubert Eberstadt
Publication Date:
09/28/1965
Assignee:
Sichel, Ramon Hubert Eberstadt
Other Classes:
40/638, 462/901
International Classes:
G09F3/10; G09F3/02
US Patent References:
| 3094342 | Carbon sheet and assembly | | | |
| 3113516 | Data input preparation | | | |
| 3133752 | Convertible billing and reply envelope | | | |