File:Richard Petri.jpg
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![File:Richard Petri.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Richard_Petri.jpg/398px-Richard_Petri.jpg?20160903093739)
Size of this preview: 398 × 599 pixels. Other resolutions: 159 × 240 pixels | 319 × 480 pixels | 510 × 768 pixels | 680 × 1,024 pixels | 1,344 × 2,023 pixels.
Original file (1,344 × 2,023 pixels, file size: 137 KB, MIME type: image/jpeg)