Or were some form of digital scanners always in use?
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One guy already answered the main part of your question. But the other part was if you wanted to display a picture using negatives you could always push light through and display onto an angled mirror to a projector screen. It was possible to enlarge this way and show the photos prior to printing them all if you were trying to only pick the best photos and save paper by not printing (or…developing) every one.
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