Perpetual calendar

Details Perpetual calendar Perpetual calendar

1990-03-01

1992-03-17

Burke, Wallace R.

Office supplies; artists and teachers materials

Calendar or calendar holder

Perpetual

D19 64

Patent

active

D03246981

REFERENCES:
patent: D149083 (1948-03-01), Mooney
patent: 1144487 (1915-06-01), McGinley
patent: 2708797 (1955-05-01), Hamer
patent: 3473249 (1969-10-01), Ankrum
patent: 3806398 (1974-04-01), Lasser
Toys That Teach, 1971, p. 8, "Single-Arched Abacus" on bottom left of page.

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