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Priority to DE19702011923priorityCriticalpatent/DE2011923A1/de
Publication of DE2011923A1publicationCriticalpatent/DE2011923A1/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
G04C21/28—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by closing a contact to put into action electro-acoustic means, e.g. awakening by music