Early projection cathode ray tube
1946-53
Type M6 Geiger-Muller tube
1946-48
Early electron multiplier
1946-1948
Early 'Maze' type Geiger-Muller tube
1948-50
Early type HC4 Geiger-Muller tube
1946-48
Experimental secondary emission tube
1945-48
Early electron multiplier
1946-1948
Early Mk 1 anti-coincidence counter
1946-48
Early electron multiplier
1946-1948
Early Mk 2 anti-coincidence counter
1946-48
Early 8-pin photocell
1946-48
Early version of type M6M Geiger-Muller tube
1946-53
Early electron multiplier
1946-1948
Geiger-Muller tube
1949
Early electron multiplier
1946-1948
Early copper mesh cathode Geiger-Muller tube
1946-50
Early electron multiplier
1946-1948
Early electron multiplier
1946-1948
Early electron multiplier
1946-1948
Early type SW12 side-window Geiger-Muller tube
1946-53
Early type GM5 copper cathode Geiger-Muller tube
1940-43
8 early electron multipliers
1946-1948
Early cathode ray tube
1948-53
Early brass side-window radiation detector
1946-48
Early type TR photocell
1946-48