Tandberg casette deck

Dear Mrs:
I am a old surgeon from Santiago,Chile. Congratulations for your forum, I am a Tandberg´s collector.
I had buy a old Tandberg deck "MASTER UNIT,model TMU 502," and I can´t found it any link or reference.
It,s a big device with many buttons  with numbers 1 to 48...etc
Can you help me? Thanks in advance

It's a teaching device for foreign languages.

Here is some info on a TMU-102, but same type of device:



You'll need to translate the page.
Dear friend:
Oh,America the beatifull,always fast and kind reply¡¡¡. It,s almost my device.
Thanks for your help