File:Optical printer by Carl Louis Gregory, close view with reflectors for illumination, disc with copying lens, camera without lens, March 1943.jpg
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![File:Optical printer by Carl Louis Gregory, close view with reflectors for illumination, disc with copying lens, camera without lens, March 1943.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Optical_printer_by_Carl_Louis_Gregory%2C_close_view_with_reflectors_for_illumination%2C_disc_with_copying_lens%2C_camera_without_lens%2C_March_1943.jpg/746px-Optical_printer_by_Carl_Louis_Gregory%2C_close_view_with_reflectors_for_illumination%2C_disc_with_copying_lens%2C_camera_without_lens%2C_March_1943.jpg?20190206003737)
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