1927 – Televox – Roy J. Wensley (American)
Whilst Roy James Wensley's "Televox" came about in 1927, he had invented and patented an earlier "supervisory control system" (patent filed in 1923). This system was effectively a system that could "remotely control" equipment via power lines, wireless, telephone lines, but not sound, which is how it is differentiated with the later "Televox". Some articles give this earlier "supervisory …