Question: During the 1930s and 1940s, how did controllers visualize where aircraft were? What was the slang term used to describe what represented the aircraft? What

During the 1930s and 1940s, how did controllers visualize where aircraft were? What was the slang term used to describe what represented the aircraft? What did the controllers do when they felt aircraft were getting too close? Where did these air traffic control center services first begin?

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