1、 MIL-PRF-1/1221D NOTICE 1 23 October 2012 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, RECEIVING TYPE 6939 MIL-PRF-1/1221D, dated 2 July 2004, is inactive for new design and is no longer used, except for replacement purposes. Custodians: Preparing activity: Army CR DLA CC Navy EC Air Force 85 (Pro
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