Mechanical writing instrument

Details Mechanical writing instrument Mechanical writing instrument

1978-05-17

1980-06-17

Mancene, Louis G.

Card, picture, or sign exhibiting

Check, label, or tag

Pen- or pencil-carried indicia

G09F 300

Patent

active

042076951

ABSTRACT:
A mechanical writing instrument is provided with conversion equivalent displayed from within the instrument. An outer casing has a plurality of slots through which conversion tables around an inner shell may be selectively viewed by turning an adjustment cap which also protracts and retracts the ballpoint pen tip.

REFERENCES:
patent: 2262818 (1941-11-01), Reese
patent: 2971283 (1961-02-01), Parker
patent: 3123291 (1964-03-01), Madry
patent: 3738037 (1973-06-01), Daley

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