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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23/00
Arrangements producing acoustic signals at preselected times
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G04B23/026
Hammer driving; hammers; devices with several hammers or sounding bodies; vibrators
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