Demonstrates the differences between alternating current and direct current arc welding processes, and in particular the finer control available with AC machines at the time.
Jan 1, 1949
Jan 23, 1987
Jul 11, 2006
Jun 6, 1984
Jun 30, 1996
Jan 1, 1999
Sep 10, 2014
Jan 1, 1940
Apr 23, 1986
Jan 1, 1989
Apr 1, 1999
Jan 1, 1992
Jan 1, 1996
Jan 1, 1997
Nov 25, 2011
Jan 1, 1991
Dec 31, 1938
Feb 10, 2009
