Hysteresis is an output's dependence on both current and historical input. This is necessary because the current state is affected by historical inputs.
AnswerGalvin Manufacturing Corporation founders Paul Galvin and Joseph came up with the idea of putting radios in automobiles in the the 1930s. In 1928 they began selling Battery Eliminators which allowed battery powered radios to use a regular electrical outlet. The idea for a radio in an automobile came later, their first model called a "Motorola". They later changed their company to the same name.
Neal Kyser McNaughten (and probably others) Although there is no documentation to prove it, my father, Neal Kyser McNaughten, born in 1911, built a radio into a Model T some time in the late 1920s. It had a paper cone and used it's own dry cell since the car had no battery. He claimed that it was particularly of interest to the young ladies...
Because it works
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A "Not" gate is also called a "hex inverter". It's a binary logic gate that inverts the input. If the input is "1", the output will be "0".