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Olga Gray and the Woolwich Arsenal Spy Ring
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Catalogue reference: ADM 258/71
This record is about the Sea bed motion resulting from aircraft mine drops: possibility of using geophone... dating from 1954 in the series Admiralty: Underwater Countermeasures and Weapons Establishment and predecessors:.... It is held at The National Archives, Kew.
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Sea bed motion resulting from aircraft mine drops: possibility of using geophone mine watching stations.
Includes 1 photograph depicting: Experimental 3-component Geophone Assembly. Dated [1954].
ADM 258
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Sea bed motion resulting from aircraft mine drops: possibility of using geophone...
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