UL-497 Complete Document History
Standard for Protectors for Paired-Conductor Communications Circuits

Complete Current Edition:
   7TH EDITION - PROTECTORS FOR PAIRED CONDUCTO - April 25, 2001
   CHANGE 06/04 - REVISION CHANGE - CODE A - June 14, 2004
   CHANGE 04/09 - REVISION CHANGE - CODE A - April 9, 2009
   CHANGE 07/13 - REVISION CHANGE - CODE A - July 19, 2013
   CHANGE 10/17 - REVISION CHANGE - CODE A - Oct. 6, 2017
   CHANGE 07/22 - REVISION CHANGE - CODE A - July 25, 2022

Obsolete Revision Information:
   CHANGE 05/01 - PROTECTORS FOR PAIRED CONDUCTO - May 21, 2001
   6TH EDITION - PROTECTORS FOR PAIRED CONDUCTO - July 25, 1995
   1991 EDITION - PROTECTORS FOR COMMUNICATION C - Feb. 27, 1991
   1978 EDITION - PROTECTORS FOR COMMUNICATION C - Dec. 15, 1978