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Frank's electron Tube Data sheets Philips historical tube data by Adri de Keijzer †  

Books
1927_Philips_Radio.pdf2010-08-08 11:26:44 25590155 bytes
1929_Philips_AmateurZendlampen.pdf2010-08-08 11:43:08 14314486 bytes
1929_Philips_Tubes_Redresseurs.pdf2010-08-08 11:40:30 6070849 bytes