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BELL 51 spare speech unit 900 series for use with 12 ways upwards 912+
BELL 51 spare speech unit 900 series for use with 12 ways upwards 912+ BST51
BELL 61 spare speech unit 900 series up to 10ways (901-910)
BELL 61 spare speech unit 900 series up to 10ways (901-910) BST61