Perforation hand punch

Details Perforation hand punch Perforation hand punch

1989-08-04

1991-01-29

Watts, Douglas D.

Cutlery

Perforating or indenting implements

Pivoted handles

30358, 30359, B26F 104, B26F 314, B26F 100

Patent

active

049876830

ABSTRACT:
A perforation hand punch for coding cards has a coding field 31 in its male-female perforation arrangement having four columns and two rows. Accordingly, 4 punch pins may be distributed in a 8 punch pin positions 32, 34, 36, 37, 38, 39, 41 and 42 in a coded manner. Consequently more than 50 different person-related perforation coding can be provided which have 4 holes in each case as standard, so that the risk of forgery as a result of over-punching as in the case of mixed 2- and 4-hole coding is eliminated.

REFERENCES:
patent: 1529887 (1925-03-01), Harris et al.
patent: 1936783 (1931-03-01), Chase
patent: 3672055 (1972-06-01), Krueger
patent: 3748737 (1973-07-01), Duff et al.
patent: 4020554 (1977-05-01), LaTourette
patent: 4476633 (1984-10-01), Brych
patent: 4768693 (1988-09-01), Tomaszewski

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