 Their patented invention of the first "snow cannon" used a garden hose, a 10-horsepower compressor, and a spray-gun nozzle, which produced about 20 inches of snow.1950 Hamming code

1950 Teleprompter

A teleprompter is a display device that prompts the person speaking with an electronic visual text of a speech or script.Using a teleprompter is similar to the practice of using cue cards.