In what year did the Bell System first make the push-button, “touch-tone” telephone commercially available?

I remember when they first came out and I thought what a marvel of science. look at what we have today and were we will be in 50 years.

old metal worker, we had the old dial phone into the eighties. I don't think we got a push button until about 1985.

old metal worker, I'm glad they invented touch tone phones. the old rotary dialing was a pain especially for doctors offices