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This is an overhead projector that was used in my classes from K-7th grade
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My teacher would take the class to the library for an hour once a week and would teach us how to type on a keyboard.
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It wasn't until my 8th grade year in 2012 where I was introduced to the smart boards.
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As technology continued to grow, in high school i was introduced to the camera projector for teachers. The camera would turn on and they would write on a paper that reflected on the screen for everyone to see.
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Finally the multimedia projector was introduced which is still used in all my classrooms today. This is where you can hook up your lap top to the projector and it reflects on the screen for everyone to see. (Power point slides, articles, etc)