A google search brought up this spec sheet. Looks like there was even a push button selectable version.
**broken link removed**
Here's the patent that covers the pushbutton version.
https://patents.google.com/patent/US3919505
The patent, as well as other references that google found, dates the product around 1974. While I see very little use to this in anything I do currently, I can't personally judge what it's comercial value to the electronics industry might have been in 1974. I was still in high school.
Good job! I could not find anything on the internet about that product.
Ratch