Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jacob HiestandfiledCriticalJacob Hiestand
Publication of CH57661ApublicationCriticalpatent/CH57661A/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
G04C21/20—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by closing a contact to ring an electromechanical alarm
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
CH57661A1911-11-291911-11-29Durch einen Wecker in Tätigkeit setzbare elektrische Alarmvorrichtung
CH57661A
(de)