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Prototype "portable" depth recorder used as part of 808 fathometer system

Prototype “portable” depth recorder used as part of 808 fathometer system. Bulletin 13 of the Association of Field Engineers, 1939, p. 102

Photo Category: Charting - Soundings - Electronic

Author: Association of Commissioned Officers/ NOAA

License: Public Domain Mark 1.0 (Public domain)
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Added On
18th October 2015
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