FIELD: manufacture of securities.
SUBSTANCE: metallographic printing form has printing members disposed on working surface and made in the form of deepened strokes having cross section profile of asymmetric shape with various angles of inclination of side faces.
EFFECT: increased extent of protection of securities from counterfeit.
17 cl, 4 dwg
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Authors
Dates
2005-04-10—Published
2004-04-28—Filed