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Title: By 1144L triode valve, from output stage of Marconi BD6 122 [Go to resource]
Description: By 1144L triode valve, from output stage of Marconi BD6 122 (250 kw) h.f. transmitter; envelope cracked License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1982-361 Go to resource More Like this...
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