UL-551 › Historical Revision Information
Standard for Transformer-Type Arc-Welding Machines

UL-551 - REVISION 1989 - SUPERSEDED
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Standard for Transformer-Type Arc-Welding Machines


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Document Number

UL-551

Revision Level

REVISION 1989

Status

Superseded

Publication Date

June 15, 1989

Page Count

4 pages