THE COSMIC COMPUTER

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panels. The switches and buttons were all marked for machine-control in
different steps of power-unit production. That was all for the big
stuff, powered centrally. There weren't any controls tor lifters or
conveyers or other mobile equipment. Evidently they were handled out in
the shop, from mobile control-vehicles. He did find, on the
communication-screen panel, a lot of things that had been left on. He
snapped them off, one after another, snapping them on when a screen went
dark. There were fifteen or twenty robots, some rather large, in the air
or moving on the floor by now.

"We can't do anything here," he told Anse. "These are the shop-cleaning
robots. They were the last things used here when the place closed down,
and the two supervisors were probably controlled from a vehicle, and
it's anybody's guess where that is now. When you threw that switch, it
sent out an impulse that activated them. They're running their
instruction-tapes, and putting the others through all their tricks."