NAS-521 Complete Document History
Coupling, Flexible, Low Pressure, 250 Degrees F, Air Line

Complete Current Edition:
   3RD EDITION - REAFFIRMED IN 2015 - Aug. 26, 2011

Obsolete Revision Information:
   2ND EDITION - COUPLING-FLEXIBLE, LOW PRESSURE, 250 DEGREES F, AIR LINE - Dec. 1, 2007
   1ST EDITION - COUPLING, FLEXIBLE, LOW PRESSU - Oct. 15, 1993
   VALIDATION NOTICE 1 - VALIDATION NOTICE 1 FOR BASE - May 19, 1993
   BASE - COUPLING, FLEXIBLE, LOW PRESSU - March 16, 1953