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Basic methods for the calibration of sonar equipment. EQUIPMENT AT MOUNTAIN LAKES 85. Fici'RE 20. 'lypical Indrophonc inoiiiitiii^s: (A) lA li- dioplioiie, (15) 3A hydiophonc, (C) XMX hydrophone. three-piece extension rods.
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A sonar map of the two debris fields from the crash of EgyptAir Flight 990 hangs in the National Transportation Safety Board's offices at Quonset Point in North Kingstown, Rhode Island December
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