Catalogue description papers incl history of hydrophone development at Portland, with photographs rel to HMS...

This record is held by National Museum of the Royal Navy

Details of 2009.111
Reference:	2009.111
Description:	papers incl history of hydrophone development at Portland, with photographs rel to HMS Vernon
Date:	1917-19
Held by:	National Museum of the Royal Navy, not available at The National Archives
Other reference:	See Annual Return 2009

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