This idea is at least sixty years old. Science fiction fans recall the 1960 short story Callihan and the Wheelies by Stephen Barr:
Amanda glared at the little object on wheels - it was about the size of a rollerskate and it seemed to be considering what to do next. It turned its photoelectric scanners this way and that, waving its jointed grappling arms about. Then it appeared to make up its mind, and trundled over to a wall socket in the baseboard, plugged itself in and proceeded to recharge itself.
(A self-charging robot)
Scroll down for more stories in the same category. (Story submitted 4/19/2019)
Humanoid Robots Building Humanoid Robots
''Pardon me, Struthers,' he broke in suddenly... 'haven't you a section of the factory where only robot labor is employed?'' - Isaac Asimov (1940)
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Humanoid Robots Building Humanoid Robots
''Pardon me, Struthers,' he broke in suddenly... 'haven't you a section of the factory where only robot labor is employed?''
Stratospheric Solar Geoengineering From Harvard
'Pina2bo would have to operate full blast for many years to put as much SO2 into the stratosphere as its namesake had done in a few minutes.'