File:Optical printer by Carl Louis Gregory, rear side, March 1943.jpg
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![File:Optical printer by Carl Louis Gregory, rear side, March 1943.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Optical_printer_by_Carl_Louis_Gregory%2C_rear_side%2C_March_1943.jpg/745px-Optical_printer_by_Carl_Louis_Gregory%2C_rear_side%2C_March_1943.jpg?20190206003742)
Size of this preview: 745 × 599 pixels. Other resolutions: 298 × 240 pixels | 597 × 480 pixels | 955 × 768 pixels | 1,273 × 1,024 pixels | 1,851 × 1,489 pixels.
Original file (1,851 × 1,489 pixels, file size: 2.17 MB, MIME type: image/jpeg)