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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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Original file (445 × 835 pixels, file size: 45 KB, MIME type: image/png)
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
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 |
The following other wikis use this file: