Old NEC allowed dryers to use the ground for a neutral, for powering the 120V motor, and had a 3 prong 30A plug/socket. New ones have a four prong 30A plug and socket. Stoves have always had a four prong 50A plug and socket so far as I know. Going back farther in time, stoves and dryers were often hard wired to a junction box with a piece of flexible conduit.
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