File:Gundlach periscope 360.jpg
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![File:Gundlach periscope 360.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Gundlach_periscope_360.jpg/374px-Gundlach_periscope_360.jpg?20140303072913)
Size of this preview: 374 × 600 pixels. Other resolutions: 150 × 240 pixels | 567 × 909 pixels.
Original file (567 × 909 pixels, file size: 170 KB, MIME type: image/jpeg)