CH558562ACH1140172ACH1140172ACH558562ACH 558562 ACH558562 ACH 558562ACH 1140172 ACH1140172 ACH 1140172ACH 1140172 ACH1140172 ACH 1140172ACH 558562 ACH558562 ACH 558562A
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CH
Switzerland
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CH1140172A
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Publication of CH558562ApublicationCriticalpatent/CH558562A/xx
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