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Edgerton Lab Notebook 22, Page 46
April 20, 1954
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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

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