Electron multiplier designed by Dr van den Bosch
1945
Early electron multiplier
1946-1948
Early electron multiplier
1946-1948
One ten stage electron multiplier
Early electron multiplier
1946-1948
Early electron multiplier
1946-1948
Early electron multiplier
1946-1948
Early electron multiplier
1946-1948
Early electron multiplier
1946-1948
Early electron multiplier
1946-1948
8 early electron multipliers
1946-1948