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De Forest

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Lee De Forest was the first person to place a third electrode into the thermionic valve, this he did in 1906.

See The Audion and De Forest.

See The 'Electro' Audion of 1911.

See Type T Tubular Audion Bulb.

See A History of the Grid.

See DV and DL valves.

See Isolantite.

See Centenary of Lee de Forest's Birth.

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