Documento 71 - Small black ring-binder containing a typescript survey of British Radar Systems currently in use or under development, April 1943, with a summary of projects under discussion by the Radio Board.

1 folder

A label at the front of the binder reads 'Property of Professor G.P. Thomson, Deputy Chairman, Radio Board. With the compliments of London Mission, O.S.R.D.' [the producers of the survey].
At the back of the binder are 4 pp. ms. notes by Thomson on radar.