UFGS 27 21 00.00 20 Intercommunication System  

History: Below is a listing of the Revisions and Changes made to this UFGS.

KEY PREPARING ACTIVITY (PA) A Army N Navy F Air Force S NASA
ACTION N New R Revision C Change D Deletion
Release PA Action Change # Nature of Change or Revision
Apr-2006 N R

To conform with CSI MasterFormat, replacing without change UFGS-16822N (August 2003)