Perpetual calendar

Details Perpetual calendar Perpetual calendar

1992-02-10

1994-03-01

Dorner, Kenneth J.

Card, picture, or sign exhibiting

Calendars

Rotatable

40115, 283 2, G09D 308

Patent

active

052896498

ABSTRACT:
A perpetual calendar is disclosed which contains base and top members and a rotating disk member in between. The top member has two arcuate window openings, through one of which is seen the days of the month, and through the other of which is seen numerical indicia corresponding to a particular year desired. The back of the base member carries a key to the year indicia in matrix form which is accompanied by instructions for its use.

REFERENCES:
patent: 786177 (1905-03-01), Andrew
patent: 1692758 (1928-11-01), Nogrady
patent: 2116288 (1938-05-01), Schoenbaum
patent: 2191757 (1940-02-01), Hacker
patent: 2631391 (1953-03-01), Hanna
patent: 2815596 (1957-12-01), Russell
Mechanica Popular (Popular Mechanics) (no date) (untranslated and translated).

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