Piece
Military Operational Research: WO 291
Catalogue reference: PRO 57/5595
Date: 1983 Jan 01-1986 Dec 31
Military Operational Research: WO 291
Piece
Field study of "Hallmark" speech security device used with radio relay WS B70. Includes...
Catalogue reference: WO 291/1600
What’s it about?
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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Full description and record details
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Reference (The unique identifier to the record described, used to order and refer to it)
- WO 291/1600
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Date (When the record was created)
- 1954
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Description (What the record is about)
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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.
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Held by (Who holds the record)
- The National Archives, Kew
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Former department reference (Former identifier given by the originating creator)
- Report No:: 7/54
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Legal status (A note as to whether the record being described is a Public Record or not)
- Public Record(s)
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Closure status (Whether the record is ‘open’ (available to the public) or ‘closed’ (not available due to a legal exemption))
- Open Document, Open Description
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Record URL
- https://beta.nationalarchives.gov.uk/catalogue/id/C1824854/
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Series information
WO 291
Ministry of Supply and War Office: Military Operational Research Unit, successors...
See the series level description for more information about this record.
Catalogue hierarchy
Over 27 million records
This record is held at The National Archives, Kew
9,787,085 records
Within the department: WO
Records created or inherited by the War Office, Armed Forces, Judge Advocate General,...
2,789 records
Within the series: WO 291
Ministry of Supply and War Office: Military Operational Research Unit, successors...
You are currently looking at the piece: WO 291/1600
Field study of "Hallmark" speech security device used with radio relay WS B70. Includes...
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