jan 1, 1945 - OVERHEAD PROJECTROR
Description:
Roger Appledorn was responsible for the technology that was used for the first overhead projector. n 1945, the U.S. Army used overhead projectors for training just as World War II was ending. Then in the late 1950s and early 1960s, overhead projectors began to be used in schools and businesses.Added to timeline:
Date:
jan 1, 1945
Now
~ 80 years ago