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Subject: Thermionic valves
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Thermionic Valves 1904-1954
UK0108 NAEST 185
1955
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Issue 49
UK0108 NAEST 117/4
1993-01
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Issue 50
UK0108 NAEST 117/5
1993-04
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Specification from Patent No.223,625 of 1923 for Improved Means for Transmitting and Amplifying selected Alternating Potentials [Thermionic Valve Circuits]
UK0108 SC MSS 100/49
1924
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Specification from Patent No.273,817 of 1926 for Method of and Means for Amplifying Selected Alternating Potentials [Thermionic Valve Circuits]
UK0108 SC MSS 100/50
1927
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Metropolitan-Vickers
UK0108 SC MSS 159/01/04
1924-1972
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Articles and papers [file 1]
UK0108 SC MSS 159/09/01
1924-1935
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