Why has all the technical info been removed oover time? 

I was suprised to just see "erotic" vibrators in this article, and in selecting the history at randowm, I see that it used to contain, much more interesting uses of the term, (compators for constuction, joggers for paper, cell phone allert devices (including pictures) and the application I think of forvibrator, a switching device for a battery operated power supply, example battery operated radios...

Why the single mainded persuit of one fringe application?