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TELEPHONIE SELE TIONNEE
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TELEPHONIE SELE TIONNEE
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Priority to FR7217401ApriorityCriticalpatent/FR2184415A1/fr
Publication of FR2184415A1publicationCriticalpatent/FR2184415A1/fr
G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B1/00—Systems for signalling characterised solely by the form of transmission of the signal
G08B1/08—Systems for signalling characterised solely by the form of transmission of the signal using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal