theoldrobots is a great resource. I didn't cite it directly because I followed it back to primary sources in many cases, but I leaned on it heavily while writing the article. It seems to be the only site on personal robots with anywhere near the breadth and depth of information necessary for even casual research on the personal robot industry as a whole.
It's not too surprising. The first of these were produced in the immediate aftermath of Star Wars' success, & the entire personal robot boom occurred during the original theatrical releases of the trilogy. Plus, a trash can on wheels is one of the easiest mobile robot designs to get working.
