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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:54, 22 July 2009 | ![]() | 445 × 835 (45 KB) | Hans Adler | {{Information |Description={{en|1=Pigeon camera, patent drawing of invention by Christian Adrian Michel.}} |Source=Swiss patent CH192864 |Author=Unknown who drew it, Christian Adrian Michel (1912-1980) was the patent applicant |Date=1937-12-01 |Permission |
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