Disk for a menstrual calendar

Details Disk for a menstrual calendar Disk for a menstrual calendar

1979-01-24

1981-10-13

Word, George P.

Printing and office machinery

Typewriter or calculator

Calculator

D19 25, D1801

Patent

active

D02612755

REFERENCES:
patent: D226955 (1973-05-01), Papavasilou
patent: 2244514 (1941-06-01), Cwiekalo
patent: 2808206 (1957-10-01), Gomez-Rodriguez
patent: 3534905 (1970-10-01), Kull

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