It's easier than installing tiny speed bumps inside the power cords.
"It's the late 1970s and pilot fish (who swears this tale is true) is working as an IBM customer engineer. No, fish explains, CEs didn't design customers; they fixed typewriters.
As a new graduate of the company's three-month training program, fish is assigned to accompany a senior CE to learn the ropes before being given a territory of his own. Many of the calls involve cleaning IBM Selectrics, which would slow down as their almost entirely mechanical workings became gummy with age. (Despite their name, there are only three electrical components to a Selectric typewriter: the motor, the on/off switch and the power cord.)..."
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