UL-551 › Complete Document History
Standard for Transformer-Type Arc-Welding Machines
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8TH EDITION - TRANSFORMER-TYPE ARC-WELDING MACHINES - April 24, 2009
CHANGE 07/09 - REVISION CHANGE - CODE B - July 15, 2009
CHANGE 12/09 - REVISION CHANGE - CODE B - Dec. 31, 2009
CHANGE 06/11 - REVISION CHANGE - CODE B - June 23, 2011
CHANGE 10/13 - Revision Change - Code B - Oct. 29, 2013
CHANGE 11/13 - REVISION CHANGE - CODE B - Nov. 19, 2013
CHANGE 01/03/18 - REVISION CHANGE - CODE B - Jan. 3, 2018
CHANGE 01/08/18 - REVISION CHANGE - CODE B - Jan. 8, 2018
CHANGE 06/22 - REVISION CHANGE - CODE B - June 2, 2022
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Obsolete Revision Information: |
CHANGE 05/06 - REVISION CHANGE - CODE A - May 11, 2006
7TH EDITION - TRANSFORMER-TYPE ARC-WELDING M - Jan. 10, 1994
REVISION 1989 - TRANSFORMER-TYPE ARC-WELDING M - June 15, 1989
REVISION 1987 - TRANSFORMER-TYPE ARC-WELDING M - Sept. 1, 1987
1987 EDITION - TRANSFORMER-TYPE ARC-WELDING M - Jan. 27, 1987
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