Index card file

Details Index card file Index card file

1990-10-15

1992-12-01

Holtje, Nelson C.

Office supplies; artists and teachers materials

Office equipment not elsewhere specified

Holder or file

D19 75, D19 86, D19 90

Patent

active

D03314243

REFERENCES:
patent: D101974 (1936-11-01), Sengbusch
patent: D247042 (1978-01-01), Neilsen et al.
patent: D248963 (1978-08-01), Macowski
patent: D250343 (1978-11-01), Macowski
patent: D251848 (1979-05-01), Hollerith
patent: D312661 (1990-12-01), Lesczak
patent: D323188 (1992-01-01), Evenson et al.
patent: D323532 (1992-01-01), Evenson
patent: D323533 (1992-01-01), Williams

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