UL-1971 › Complete Document History
Standard for Signaling Devices for the Hearing Impaired

Complete Current Edition:
   3RD EDITION - SIGNALING DEVICES FOR THE HEAR - Nov. 29, 2002
   CHANGE 05/04 - REVISION CHANGE - CODE A - May 3, 2004
   CHANGE 07/05 - REVISION CHANGE - CODE A - July 20, 2005
   CHANGE 05/06 - REVISION CHANGE - CODE A - May 19, 2006
   CHANGE 10/08 - REVISION CHANGE - CODE A - Oct. 15, 2008
   CHANGE 10/13 - REVISION CHANGE - CODE A - Oct. 31, 2013
   CHANGE 08/18 - REVISION CHANGE - CODE A - Aug. 29, 2018

Obsolete Revision Information:
   2ND EDITION - SIGNALING DEVICES FOR THE HEAR - Oct. 17, 1995
   1992 EDITION - SIGNALING DEVICES FOR THE HEAR - Jan. 1, 1992