Overhead Projector - a classroom staple of the 80's and 90's : r/nostalgia
Classroom Projector
Overhead projector teacher hi-res stock photography and images - Alamy
How Does An Overhead Projector Work? - Pointer Clicker
irememberSG - Ah, the classic Overhead Projectors (OHP)! Were you one of those enthusiastic students who scrambled to help your teacher set it up in class? The OHP, which is usually parked
The Overhead Projector: how it bowled its way into the classroom | ETEC540: Text Techologies