This image is released under a CC BY-NC-SA 4.0 Licence
Buy this image as a print
License this image for commercial use at Science and Society Picture Library
MOV/ GEC valve, type D.E.R., marked G 27/234 V.T. No Science Museum Group © The Board of Trustees of the Science Museum
MOV/ GEC valve, type D.E.R., marked G 27/234 V.T. No. 33 1560, (RMW/E148 - McVitie Weston number), by M-O Valve Co. Limited; General Electric Company Limited.