Taking a look at this presentation system from the '60s which utilizes analog audio on a grooved "floppy" disc in combination with a photographic slide. The system was automatic, using tones recorded along with narration to advance the slides.
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Watch video The 3M Multimedia Sound-Slide System Vintage 1960s online without registration, duration hours minute second in high quality. This video was added by user databits 23 March 2023, don't forget to share it with your friends and acquaintances, it has been viewed on our site 4,778 once and liked it 374 people.