Piece
Military Operational Research: WO 291
Catalogue reference: PRO 57/5595
Date: 1983 Jan 01-1986 Dec 31
Military Operational Research: WO 291
Piece
Catalogue reference: WO 291/1600
This record is about the Field study of "Hallmark" speech security device used with radio relay WS B70. Includes... dating from 1954 in the series Ministry of Supply and War Office: Military Operational Research Unit, successors.... It is held at The National Archives, Kew.
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Field study of "Hallmark" speech security device used with radio relay WS B70.
Includes 2 photographs depicting: Operational Research Section (BAOR): `Hallmark' telephone exchange system - views of equipment. Composite photographs. Dated 1954.
WO 291
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Records created or inherited by the War Office, Armed Forces, Judge Advocate General,...
Ministry of Supply and War Office: Military Operational Research Unit, successors...
Field study of "Hallmark" speech security device used with radio relay WS B70. Includes...
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