File:Installing acoustic receivers (black cylinder) in the Iller (c)Ine Pauwels, INBO.jpg
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To ancor the acoustic receivers (black cylinder) in the river bed they are mounted onto metal pyramids which are then placed on their location in the river with a boat.
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current | 14:25, 21 October 2020 | 1,040 × 585 (517 KB) | LB (talk | contribs) |
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