pdf 1959 - Headset Amplifier Introduction - Telephony Mag. Popular

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Headset Amplifier Introduction.pdf

1959 - Headset Amplifier Introduction - Telephony Mag.

"Bell Transistor Amplifier Aids Telephone Operator," Telephony, 3/21/59, Cover and p.51.? Also ad for Automatic Electric featuring AE 88-T speakerphone.

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