Perpetual calendar

Details Perpetual calendar Perpetual calendar

1990-01-04

1992-01-21

Burke, Wallace R.

Office supplies; artists and teachers materials

Calendar or calendar holder

Perpetual

Patent

active

D03233472

REFERENCES:
patent: 866172 (1907-09-01), Westphall
patent: 1266610 (1918-05-01), Moerk
patent: 2051264 (1936-08-01), Maddock
patent: 2335713 (1943-11-01), Vogel
patent: 3984107 (1976-10-01), Nelson

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