Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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
G04C21/326—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 adjustable from the different places themselves
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
Ferroelektrische Kristallmatrix mit einer Koordinatenanordnung von Leitungen zur Feststellung der Identitaet der Teilnehmernummer eines Fernsprechteilnehmers
Einrichtung zur Summierung von durch ein Impulsverfahren zeitlich nacheinander fernuebertragenen Messgroessen, insbesondere zur Messung der Gesamtleistung bei Lieferung und Bezug von elektrischer Energie