Magnetic perpetual calendar

Details Magnetic perpetual calendar Magnetic perpetual calendar

1994-04-05

1996-02-27

Word, A. Hugo

Office supplies; artists and teachers materials

Calendar or calendar holder

Perpetual

D18 7

Patent

active

D03674967

REFERENCES:
patent: D213705 (1969-04-01), Rosenberg
patent: D241363 (1976-09-01), Chamberlin
patent: D274535 (1984-07-01), Hicks
patent: 301553 (1884-07-01), Bereman
patent: D334945 (1993-04-01), Hill
patent: 4472892 (1984-09-01), Yang
patent: 4934076 (1990-06-01), Fowler
patent: 4975061 (1990-12-01), Avrill

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