Radioactive source for: Avo No 1 Mk 2 Radiac Survey Meter, by AVO Limited (formerly the Automatic Coil Winder and Electrical Equipment Company or ACWEECO), London, SW1, England, 1950-1969. Radioactive source for Radiac survey meter 1950-1969
X-ray tube with separate anode, heavy cathode and automatic mica disc vacuum regulator, by C. H. F. Muller, Hamburg, Germany, 1906. X-ray tube with separate anode
G.E. Coolidge x-ray tube, anode no. X1812, by General Electric, United States, 1940-1959. G.E. Coolidge x-ray tube