the wikipedia article on the Belleville Three says the "first wave of Detroit techno" was some of the future members meeting and forming Cybotron, releasing Alleys of Your Mind in 1981 https://www.youtube.com/watch?v=kMHNhJJnve4 to me this is quite clearly Kraftwerk inspired, and Kraftwerk had been going for about 10 years at that point.
1981 puts them after Devo had been around awhile, and Talking Heads and B-52s, which were more pop but featured many of these sounds, and contemporaneous with Depeche Mode, Eurythmics, and Yaz/Yazoo.
Two years later Cybotron released Clear which is Kraftwerk blended with more of a funk sound https://www.youtube.com/watch?v=V3QHj7lai9I
I'm not trying to assign/give/take credit, just saying here's what they sounded like and who else sounded similar to me. Zappa and P Funk are generally noted as having explored these sounds early on, but I don't enjoy their stuff so much so I don't listen to it much. This comment is a bit of "you might try listening to this" if you're interested.
I don't remember when we all started saying techno, it was definitely in full swing in the 90's, I think it was the 80's but gotta admit, I dunno.