here's a fascinating vintage Swiss washing machine that uses punch cards to program the wash cycle! 
"For my laundry, I prefer Schulthess." she's holding the punch cards that she used to select a particular type of wash cycle. i wonder if anyone ever tried to custom make one of these cards... 🤔
turns out the company is still around, and still making washing machines! schulthess.ch i suppose you need one of these if you want your clothes to be Swiss Clean™
aren't these just lovely? 😍
another vintage Schulthess ad.
😍
the top row of sprocket holes are used to draw the card into the reader and pull it along using a low-speed motor/timer. the holes and slots control switch contacts that activate the various functions of the washer--the valves, motor, and perhaps solenoids.
it is more common for a washer to have a control unit like this, with fixed cams that open and close switch contacts. incredibly, in 2021, many washers *still* use this type of mechanism.
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