Perpetual calendar

Details Perpetual calendar Perpetual calendar

1976-06-04

1978-02-28

Pitrelli, John F.

Card, picture, or sign exhibiting

Calendars

Charactered slide

G09D 310

Patent

active

040757749

ABSTRACT:
A calendar having a front sheet with holes arranged in seven vertical and six horizontal rows. Seven slides are provided, each slide is adapted to slide in one of said vertical rows. Each slide has numbers arranged in a vertical row on the front and another on the back. Each slide is supported behind one of said vertical rows of holes with the numbers on one side of said slide exposed through the holes. The slides can be arranged behind said vertical rows of holes with the numbers thereon exposed through the holes in the order of the days of the weeks and months of the year, for any year.

REFERENCES:
patent: 1373744 (1921-04-01), Kelly
patent: 2499329 (1950-02-01), Potter

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