Demountable tetrode valve, type 43 E3, by Metropolitan-Vickers Electrical Co. Ltd., Trafford Park, Trafford, Manchester, Cheshire, England, 1939. The demountable tetrode valve was part of a Chain Home Transmitter. Metropolitan-Vickers demountable tetrode valve, type 43 E3 1939
Gasket, from a demountable tetrode valve, type 43 E3, by Metropolitan-Vickers Electrical Co. Ltd., Trafford Park, Trafford, Manchester, Cheshire, England, 1939. The demountable tetrode valve was part of a Chain Home Transmitter. Gasket, from a Metropolitan-Vickers demountable tetrode valve 1939
Velometer, serial no. 2807850, by Associated Electrical Industries Ltd, Trafford Park, Manchester. Date of manufacture 1961 Velometer, serial no. 2807850 1961