It is a Bell Telephone System Teletrainer.
The Teletrainer, in addition to practice telephones, is now an integral part of the program and is available in many Bell System communities. This amplifier and control unit produces dial tone, ringing and busy signals, and makes connections between the two telephones which accompany it. Thus, it helps create realistic classroom situations for developing conversational skills. Not only do teachers consider it valuable in teaching correct telephone usage, but the Teletrainer has also proved to be extremely useful in teaching children with speech and hearing handicaps.
from Bell Telephone Magazine, Spring 1964, as archived on the Internet Archive. Link to archived article.
A slightly better view of the knob labels. I should have pried off that Bell System device for safe-keeping.
The carrying case is quite a nifty piece of luggage, as befits its manufacturer. A closeup of the tag. I'm not EXACTLY sure what a "Telezonia" is, but YOU, especially if you watch It's Always Sunny In Philadelphia, need to check out this link!
This label inside the case shows how to hook it up. It did not come telephones. All I got was a big buzzing noise when I turned it on. At least it didn't blow up!
And here we have the back side of the device. Sort of covered up the manufacturer's name. Now we will never know!
And one last picture of the whole thing, before we say goodbye!
Goodbye!
Now hang up!
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