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giving indications at a number of places each at a different time
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Industry
CPC
G04C21/32
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Parent Industries
G
PHYSICS
G04
Horology
G04C
ELECTROMECHANICAL CLOCKS OR WATCHES
G04C21/00
Producing acoustic time signals by electrical means
Current Industry
G04C21/32
giving indications at a number of places each at a different time
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