Printed matter for blind reading and method of producing the same
United States Patent 2268890

Inventors:
Mortensen Jr., Walter A.
Publication Date:
01/06/1942
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Assignee:
Mortensen Jr., Walter A.
Primary Class:
427/195
Other Classes:
427/203, 428/195.100
International Classes:
B32B27/00; G09B21/02; G09B21/00