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Application filed by Bernhard RengglifiledCriticalBernhard Renggli
Publication of CH51719ApublicationCriticalpatent/CH51719A/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
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Physics & Mathematics
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General Physics & Mathematics
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CH51719A1911-02-111911-02-11Weckeinrichtung an Uhren
CH51719A
(de)