Perpetual blind calendars series 2

Details Perpetual blind calendars series 2 Perpetual blind calendars series 2

1990-05-22

1991-06-25

Bell, Paul A.

Printed matter

Calendar

283117, B42D 1500

Patent

active

050260952

ABSTRACT:
The present invention deals with a variety of advanced perpetual calendars, combined calendars, multiple calendars.

REFERENCES:
patent: 1233447 (1917-07-01), Carpenter
patent: 1608411 (1926-11-01), Mateju
patent: 3514884 (1970-06-01), Passariello
patent: 3605307 (1971-09-01), Dickson
patent: 4251935 (1981-02-01), Wright
patent: 4285148 (1981-08-01), Kolar
patent: 4793634 (1988-12-01), Alloggiamento
patent: 4813707 (1989-03-01), Habib
patent: 4828290 (1980-05-01), Harris

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