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A U.S. Navy Bell XHSL-1 (Bell Model 61) prototype in flight, the first USN helicopter fitted with a dipping sonar. Circa 1953.
A U.S. Navy Bell XHSL-1 (Bell Model 61) prototype in flight, the first USN helicopter fitted with a dipping sonar. Circa 1953.

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Pages in category "Sonar"

The following 3 pages are in this category, out of 3 total.

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Media in category "Sonar"

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