You know when you call a business and you get a computer which tells you to press 1 for this and two for that, etc... When did that technology first come into existance? Also, when did it come into common use?
Also... when was the hold function on a phone first invented? When did it come into common use?
I've been searching the internet for an answer, but so far haven't had any luck. Any help would be appreciated.
ML
