Transistor Radio
These went out of style when everyone started using Walkmen and other smart devices, but some people remember transistor radios everywhere in the 1960s and 1970s. It is generally regarded as among the most commonly used digital devices in history.
Gas Shortage
In 1973 and 1979, the United States faced a prolonged gas shortage. There were lines all over the lane, and odd-even rationing was introduced, which meant that if the last digit of your license plate was odd, you could only get gas on unfortunate days.