Biology pamphlets. supplement

Biology pamphlets. supplement

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The personnel should be familiar with the producera#39;s manual of the echo sounder , especially with the section dealing with troubleshooting. ... On ships having sonar operators, it is their duty to monitor the echo sounders and keep them in working order. ... The automatic recorders of modern echo sounders are usually designed for 8 to 12 hours of uninterrupted operation;* electronic indicators can operateanbsp;...

Title:Biology pamphlets. supplement
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