Perpetual calendar

Details Perpetual calendar Perpetual calendar

1984-09-27

1988-08-16

Herrmann, Winifred E.

Office supplies; artists and teachers materials

Calendar or calendar holder

Perpetual

D20 15, D21108

Patent

active

D02972441

REFERENCES:
patent: D8466 (1875-07-01), Lyman
patent: D190492 (1961-06-01), Eickmeyer et al.
patent: D245422 (1977-08-01), Vanderhyden, Jr.
patent: D274535 (1984-07-01), Hicks
patent: 1432062 (1922-10-01), Greene
patent: 3670436 (1972-06-01), Weissman
patent: 4123853 (1978-11-01), Dickensheet
patent: 4472892 (1984-09-01), Yang

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