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Frank's electron Tube Data sheets Gecovalve documents  

(up)date item size
2008-04-26 1938 pricelist with tube data. 568,433 bytes
2009-11-02 Short data for Geco tubes. ☆Peter den Boer177,775 bytes
2009-11-02 Short data for Geco tubes 1939/1940. ☆Peter den Boer479,232 bytes