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Overhead Projector. These are still used in some places because you can place a clear plastic printed sh… | Childhood memories, School memories, Overhead projector
File:Overhead projector 3M 01.JPG - Wikipedia
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School technology of the 70's - overhead projectors | Childhood memories, Overhead projector, School memories
Turn off the lights and see these vintage overhead projectors from the '60s - Click Americana
Whatever Happened to the Overhead Projector? | Larry Cuban on School Reform and Classroom Practice
Overhead Projector : r/nostalgia
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