We had Touch-Tone service in the late 1960s thanks to a relative at the phone company who got us hooked up. I remember there was a song book for use with the touchtone phone. The authors took no responsibility for any long-distance charges incurred.Pushbutton phones were standard Bell System issue before the Bell System was split up. So probably more than half of those South King phones would have been modern technology. And if they were built by Western Electric (who had a plant or distribution center in Kent) they were still built like tanks.