Security device for sheet material and method of marking the dev

Printed matter – Method – Identifying

Patent

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283 57, B42D 1500

Patent

active

045823456

ABSTRACT:
A method of indicating the face value of a commercial document such as a bank draft or a check while simultaneously precluding subsequent alteration thereof.

REFERENCES:
patent: 852257 (1907-04-01), Collier
patent: 1344235 (1920-06-01), Kopecky
patent: 1465099 (1923-08-01), Stolberg
patent: 1567613 (1925-12-01), Patton, Jr.
patent: 4358852 (1982-11-01), Ichikawa et al.

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