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2. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   An overhead projector works on the same principle as a slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed. However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement ...

3. Projector - Wikipedia

   en.wikipedia.org/wiki/Projector

   In the late 1950s and early 1960s, overhead projectors began to be widely used in schools and businesses. The first overhead projector was used for police identification work. [citation needed] It used a celluloid roll over a 9-inch stage allowing facial characteristics to be rolled across the stage. The United States military in 1940 was the ...

4. Things Boomers Took for Granted That are Obsolete Now

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   Overhead Projectors. Early 1960s-2015 ... Google Just Killed Portable GPS Devices." The second article was right. Advances in smartphone-based GPS apps, GPS platforms built into vehicles, and the ...

5. The best portable projector I've ever used is down to a ... - AOL

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   The best portable projector I've ever used is down to a record-low $479 (save $170) Rick Broida. December 1, 2022 at 5:22 AM. There's something magical about turning a wall into a movie screen ...

6. List of obsolete technology - Wikipedia

   en.wikipedia.org/wiki/List_of_obsolete_technology

   Overhead projector and slide projector: Video projector: Primarily for continued use of older materials. Some teachers find the overhead projector more convenient for lectures depending on their teaching style. Phonograph and phonograph record: Audio cassette, 8 track tape, CD, digital audio: Used to play older or archived recordings.

7. Amazon’s Portable Projector With 25,000 Reviews Is Marked ...

   www.aol.com/amazon-portable-projector-25-000...

   AuKing Mini HD Projector. Price: $99.99 $55.99 Buy On Amazon . The AuKing portable projector delivers your content in full HD resolution with 9500 lumens of brightness for clear, detailed images ...