History of tank degassers

I'm looking for some information, dates, as to when ladle tank degassing was put into service on a commercial scale. Also, when did reheating of the
ladle in the degasser (Vacuum Arc Degasser) come on line.
Thanks for your help
Lloyd Hanning
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Lloyd:
A quick google search turned up that vacuum arc degassing dates from the mid sixties. See the sample pages from the book, The Making shaping and Treating of Steel at www.aise.org/toc/chapter11.pdf
Pittsburgh Pete
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