Director unit comprising BC selector and translation field, from Deptford (TIDeway) telephone exchange, made by Siemens Brothers & Co Ltd, Woolwich, London, 1937 Director unit comprising BC selector and translation field 1937
Director unit comprising called number storage uniselectors, control uniselector, sending uniselector and relay set, from Deptford (TIDeway) telephone exchange, made by Siemens Brothers & Co Ltd, Woolwich, London, 1937 Director unit comprising called number storage uniselectors 1937