File:DeZengAO.JPG
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| Description |
English: The early DeZeng/American Optical lineage. Top left, the Phoro-Optometer, 1917; top right, the Phoroptor, 1922, bottom left, the Additive Power Phoroptor, 1934; and the 590, 1948. |
| Date | |
| Source | Own work |
| Author | DigbyDalton |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 02:51, 15 February 2015 | | 4,608 × 3,456 (5.51 MB) | DigbyDalton (talk | contribs) | User created page with UploadWizard |
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