yoshiki — discord 
David will write about it more, but if you haven't seen this: https://youtu.be/fI-uwgHIR4I?t=196 the idea goes back, and as you can read on his Wikipedia page, he did patent the idea. So you can say that it goes almost 30 years not 20.
YOUTUBE hfI-uwgHIR4I David A Smith, Virtus ICE 2 1994