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Place
Date
Marconi radio valve

Marconi radio valve

1940
Marconi valve

Marconi valve

1932
Thermionic valve

Thermionic valve

1927
Thermionic valve made by Marconi

Thermionic valve made by Marconi

1934
thermionic valve - valve,tetrode made by Osram Lamp Works Ltd, in England, United Kingdom, 1933

thermionic valve - valve

1933