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Application filed by Kroeplin Heinrich Carl FriedrifiledCriticalKroeplin Heinrich Carl Friedri
Publication of CH7145ApublicationCriticalpatent/CH7145A/de
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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General Physics & Mathematics
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CH7145A1893-06-301893-06-30Stromschlußvorrichtung für elektrische Weckuhren
CH7145A
(de)