Perpetual calendar

Details Perpetual calendar Perpetual calendar

1976-09-30

1978-06-13

Pitrelli, John F.

Card, picture, or sign exhibiting

Calendars

40120, G09D 300

Patent

active

040940829

ABSTRACT:
A perpetual calendar is provided having a frame defining an enclosure with a frontal portion provided with first indicia representing days of a week, and, within the enclosure, seven prisms removably mounted in said frame, and provided with second indicia located beneath said first indicia representing days of a month.

REFERENCES:
patent: 247000 (1881-09-01), Bath
patent: 1109814 (1914-09-01), Bailey
patent: 1635927 (1927-07-01), Curtis
patent: 3956837 (1976-05-01), Itano

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