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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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Rotary Switch, Piano Key Switch, And Lever Switch
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Mit der Welle eines Wechselstromerzeugers gekuppelte Kontaktvorrichtung zur Ein- und Ausschaltung des erzeugten Wechselstromes in beliebiger, fest einstellbarer Phasenlage
Zeitschalteinrichtung mit zwei Gruppen von Schaltstromkreisen, die durch eine Schaltuhr periodisch in zwei verschiedenen Zeiteinheiten an den einen bzw. anderen Pol der Stromquelle angeschlossen werden