Social correspondence card construction
United States Patent 3399825
US Patent References:
Postal card
- - 2430626

Flip fold mail
- - 3303987

Social correspondence card construction
- - 3352481


Inventors:
Fred, Kirchof
Publication Date:
09/03/1968
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Primary Class:
229/92.800
Other Classes:
D19/2
International Classes:
B42D15/08