pdf 1959 - Headset Amplifier Introduction - Telephony Mag. Popular
By Paul F 1691 downloads
Headset Amplifier Introduction.pdf
"Bell Transistor Amplifier Aids Telephone Operator," (292-type amplifier for switchboard use.) Telephony, 3/21/59, Cover and p.51.? Also ad for Automatic Electric featuring AE 88-T speakerphone.
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