Gjin saak it is in doarbel, kompjûter, lift, masine, swimbad, trein of fyts;winkelsintrum, stasjon, sikehûs, badkeamer, bank, woastyn, oaljefjild ... drukknopschakelaars binne oeral te sjen.Hoe soe ús libben wêze sûnder knoppen?Yn guon mjitte is de drukknop in oare foarm ...
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