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01/2019
To provide a calendar which is common in use in a date expression and an analog clock, and enhanced in visibility.SOLUTION... 
ELECTROMECHANICAL CLOCKS OR WATCHES | HOROLOGY | DISPLAY | PERPETUAL CALENDARS | RAILWAY OR LIKE TIME OR FARE TABLES | ADVERTISING | SEALS | RADIO-CONTROLLED TIME-PIECES | PHYSICS | EDUCATION | CRYPTOGRAPHY
Patent
2002, Chŭngpo., ISBN 897963000X, 773
Book
06/2016
The utility model relates to a calendar. Prior art simple structure is barren, can not recycle... 
DISPLAY | PERPETUAL CALENDARS | RAILWAY OR LIKE TIME OR FARE TABLES | ADVERTISING | SEALS | PHYSICS | EDUCATION | CRYPTOGRAPHY
Patent
1986, Chʻopʻan., 316
Book
1985, Chʻopʻan., ISBN 9788979630053, 427
Book
by Gu, Jin
1993, Di 1 ban., ISBN 9787502911881, 1, 394
Book
03/2015
A calendar comprises a box, a box door arranged on the box, a display, a color changing remote controller, a color changer and a color sampler... 
DISPLAY | PERPETUAL CALENDARS | RAILWAY OR LIKE TIME OR FARE TABLES | ADVERTISING | SEALS | PHYSICS | EDUCATION | CRYPTOGRAPHY
Patent
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