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Frank's electron Tube Data sheets Marconi documents  

(up)date item size
2002-08-04 Marconi Valves. 44 pages valve data from around 1932. Thanks to Brian Clark. 6,319,862 bytes
2008-06-04 Marconi Valves Catalogue. Thanks to Tomas Montero. 1,974,943 bytes
2009-11-26 Marconi Receiving Valves 1938. Thanks to Tomas Montero. 4,103,321 bytes