These are often called "transparencies" and were made for print publications to use. They came into widespread commercial use in the 1960s and were replaced by the 35 mm slide over time. Photos can be printed from them. I had hundreds of them from an entertainment public relations archive that I picked when I was in college. Sold them all over time.
Hope this helps.
Last edited by Exhibitman; 04-13-2025 at 11:48 AM.
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