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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21/00
Indicating the time by acoustic means
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G04B21/02
Regular striking mechanisms giving the full hour, half hour or quarter hour
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G04B21/08
Sounding bodies; Whistles; Musical apparatus
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