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AT&T offered seven different gong combinations for the "C" type ringer found in the model 500 and 2500 landline telephone sets. These gongs provided "distinctive tones" for hearing-impaired customers and to make it possible to tell which phone was ringing when several phones were placed closely together.[3] A "Bell Chime" was also offered, which could be set to chime like a doorbell or to ring like an ordinary phone.
