** An outstandingly rare WW2 Restricted military intelligence report, every distributed copy with its own unique security number, this being 'Copy No. 221'.
Very few examples of this classified and security-numbered report have survived. Because of the report's extreme rarity, few collectors know these documents exist; only a tiny handful actually owns one.
An 'ordinary' version of this restricted CIOS intelligence report was subsequently authorised for issue. The later version was given the same title but had the HMSO name as publisher on the front cover and lacked the security classification and unique identifying security numbering.
WW2 RESTRICTED INTELLIGENCE REPORT Copy No. 221. The Design of German Aircraft Hydraulic Systems, Fuel Systems and Fuel System Companents and Accessories
CIOS Intelligence Report. XXXI-41. Combined [British/US] Intelligence Objectives Sub-Committee (CIOS). June/Aug 1945.
** A major, important, and rare restricted report. This report is an attempt to give as completely as possible information obtained on the design of German aircraft hydraulic systems, fuel systems and accessories. (Introduction).
CIOS 'Black List of targets for urgent investigation' category: Jet propulsion; Aircraft engines; Aircraft
Duplicated typewritten report in English, 10 x 7.5 inches, 25 x 19 cms. 437 pages, about 150 illustrations of various types
In lovely condition, virtually as issued. Original stapled wrappers. Protected in a modern clear archival jacket.