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The first overhead projector was first used for police identification work. It used a cellophane roll over a 9-inch stage allowing facial characteristics to be rolled across the stage. The U.S. Army in 1945 was the first to use it in quantity for training as World War II wound down. It began to be widely used in schools and businesses in the late 1950s and early 1960s.
Nowadays we mainly use digital technology in training and the humble overhead projector has been replaced by the data projector.
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