Mechanical pencil

Details Mechanical pencil Mechanical pencil

1992-06-01

1994-04-26

Holtje, Nelson C.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 56, D19 51

Patent

active

D03464016

REFERENCES:
patent: D114529 (1939-05-01), Deli et al.
patent: D128391 (1941-07-01), Christenson, Jr.
patent: D324070 (1992-02-01), Suzuki

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