Device 5687

See page 37 in catalog Amperex-CC-363 (Non-receiving tubes).
See page 3 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 28, 29 in catalog RCA-RIT-104B (Industrial and communications types).



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