PRODUCT PIEZOELECTRIC RINGER(1) CARBON TELEPHONE TRANSMITTER(1) PIEZOELECTRIC RINGER(2) CARBON TELEPHONE TRANSMITTER(2) PIEZOELECTRIC RINGER(3) DYNAMIC RECEIVER(1) PIEZOELECTRIC  BUZZER DYNAMIC RECEIVER(2) ELECTROMAGNETIC RECEIVER(1) LOUDSPEAKER ELECTROMAGNETIC RECEIVER(2) ANNUNCIATOR ELECLRODYNAMIC RINGER --

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