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Description: (curated)
04/20/1954
• HEE outline: “Depth Indicator” re field-testing sonar pinger to indicate submerged bottom, on Charles River with Joe VITKA
•SCHEMATIC
• continued field-testing 04/21/1954 with assistance from [-] VAN LUONG.
Page start date: April 20, 1954
Page type: diagram, notes
Keywords:
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