Patent classifications
G
PHYSICS
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G04
HOROLOGY
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G04B
MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
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19/00
Indicating the time by visual means
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G04B19/24
Clocks or watches with date; or week-day; indicators; , i.e. calendar clocks or watches; Clockwork calendars
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G04B19/243
characterised by the shape of the date indicator
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G04B19/253
Driving or releasing mechanisms
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G04B19/25333
wherein the date indicators are driven or released mechanically by a clockwork movement
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G04B19/25353
driven or released stepwise by the clockwork movement
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G04B19/25366
manually corrected at the end of months having less than 31 days
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