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Publication of CH70524ApublicationCriticalpatent/CH70524A/de
G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
G04B23/00—Arrangements producing acoustic signals at preselected times
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Physics & Mathematics
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Acoustics & Sound
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General Physics & Mathematics
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CH70524A1914-09-231914-09-23Anrufvorrichtung mit Einrichtung zur Kenntlichmachung einer anrufenden Stelle vermittelst akustischer Signale
CH70524A
(de)