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G04C21/00—Producing acoustic time signals by electrical means
G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
G04C21/30—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times with provision for a number of operations at different times, e.g. ringing the bells in a school
G04C21/32—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times with provision for a number of operations at different times, e.g. ringing the bells in a school giving indications at a number of places each at a different time, e.g. system of alarms in a hotel
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Physics & Mathematics
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General Physics & Mathematics
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Details Of Connecting Devices For Male And Female Coupling
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Vorrichtung zur elektrischen Kontaktierung einer Solarzelle bei der Messung elektrischer Kenndaten der Solarzelle und Verfahren zur Messung elektrischer Kenndaten einer Solarzelle