рус
engSurvey echo-sounder |
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Two types of single beam echo sounders of surveying.
Portable (boat) PEL-100 echo sounder for shallow (100 m) waters; |
Survey echo-sounder |
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|
Two types of single beam echo sounders of surveying.
Portable (boat) PEL-100 echo sounder for shallow (100 m) waters; |