Air Ministry Air diagram / Ministry of Supply. 1946 Nov. [Coloured litho, being no. 4365: Reflector Klystron. See also inv. nos. 1994-1446 (MSP 119/1-2) & 1983-40/2 (MSP 120/4) for others in this series] Air Ministry Air diagram / Ministry of Supply 1946
[Air diagrams (2)] / Ministry of Supply, for promulgation by Air Ministry. 1946 Apr-Sept. [Colour lithos. See below. See also inv. nos. 1983-40/4 (MSP 120/4) and 1985-317 (MSL 350) for others in this series] Air diagrams, Ministry of Supply 1946