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Publication of BE427220ApublicationCriticalpatent/BE427220A/xx
H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
H04M11/002—Telephonic communication systems specially adapted for combination with other electrical systems with telemetering systems
H04M11/005—Telephonic communication systems specially adapted for combination with other electrical systems with telemetering systems using recorded signals, e.g. speech