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Producing acoustic time signals by electrical means
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Industry
CPC
G04C21/00
This industry / category may be too specific. Please go to a parent level for more data
Parent Industries
G
PHYSICS
G04
Horology
G04C
ELECTROMECHANICAL CLOCKS OR WATCHES
Current Industry
G04C21/00
Producing acoustic time signals by electrical means
Sub Industries
G04C21/02
Constructional details
G04C21/04
Indicating the time of the day
G04C21/06
by striking mechanism
G04C21/08
with snail
G04C21/10
with locking plate
G04C21/12
by electro-acoustic means
G04C21/14
Electro-acoustic time announcement
G04C21/16
producing the signals at adjustable fixed times
G04C21/18
by mechanically unlocking an electro-mechanical vibrator
G04C21/185
provided with means for sheeting off or temporarity stopping the signal
G04C21/20
by closing a contact to ring an electro-mechanical alarm
G04C21/205
by the hand(s) or handlike members closing the contact
G04C21/22
put into action by the arbor of a mechanical alarm work
G04C21/24
put into action by the spring of a mechanical alarm work
G04C21/26
put into action by the vibrations caused by the operation of a mechanical alarm work
G04C21/28
by closing a contact to put into action electro-acoustic means
G04C21/30
with provision for a number of operations at different times
G04C21/305
by the hand(s) or handlike members closing the contacts
G04C21/32
giving indications at a number of places each at a different time
G04C21/323
by the hand(s) or handlike members closing the contacts
G04C21/326
adjustable from the different places themselves
G04C21/34
Devices on watches or similar portable timepieces
G04C21/36
Signal repeating devices
G04C21/38
Adjusting the duration of signals
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