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File:Howard Walls (LoC, left) and Carl Gregory (NARA, right) copying a roll from the LoC Paper Print Collection, optical printer modified by Gregory, March 1943.jpg - Wikimedia Commons
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JK Optical Printer (353 BCSB) | CLAS Production Unit
Mechanical Concepts- Optical printer
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fxphd: The Role of the Optical Printer – fxguide
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