See page 7 in catalog CBS-PA-5 (Transmitting and special purpose tubes).
See page 7 in catalog CBS-Bulletin-E-290S (Military and special-purpose tubes).
See pages 6, 7 in catalog Raytheon-SP-7357-8-61-20M (Industrial amd military tubes).
See pages 4, 5 in catalog RCA-RIT-104B (Industrial and communications types).

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