When was the Elmo Projector tool invented?

The Elmo Projector, a popular document camera used in classrooms, was developed by Elmo Company, which was founded in 1921. However, the specific model known as the Elmo Projector became widely recognized in the late 20th century, particularly gaining prominence in the 1990s as technology advanced and educators sought more interactive teaching tools. The exact year of invention can vary, but it evolved significantly throughout its history.