Perpetual calendar

Details Perpetual calendar Perpetual calendar

1990-07-21

1992-06-02

Burke, Wallace R.

Office supplies; artists and teachers materials

Calendar or calendar holder

Perpetual

D20 42, D19 20

Patent

active

D03266800

REFERENCES:
patent: D126557 (1941-04-01), Lewis
patent: D241181 (1976-08-01), Jenks
patent: D252212 (1979-06-01), Harrison
patent: D268350 (1983-03-01), Cobb
patent: 1273038 (1918-07-01), Crowell
patent: 2282939 (1942-05-01), Clawson
patent: 2828567 (1958-04-01), Shoan
patent: 2896351 (1959-07-01), Johnson
patent: 3207421 (1965-09-01), Hunger et al.
patent: 3290812 (1966-12-01), Hunkins
patent: 3372503 (1968-03-01), Weeks
patent: 3777795 (1973-12-01), Graetz
patent: 3816948 (1974-06-01), Mooney et al.
patent: 4106230 (1978-08-01), Martinez
patent: 4830407 (1989-05-01), Sadler, Jr. et al.

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