MIL-HDBK-421 (NOTICE 1)
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时间:2024-05-12 20:13:36
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MIL-HDBK-421 (NOTICE 1), MILITARY HANDBOOK COMMUNICATIONS TIMING AND SYNCRONIZATION SUBSYSTEMS. MIL-HDBK-421, dated 17 May 1991, has been reviewed and determined to be valid for use in acquistion.