| http://www.w3.org/ns/prov#value | - In apparatus for applying heat to localized areas of a hollow workpiece having a relatively thin-walled unsupported distal edge portion tending to distort in the presence of said heat, the combination of: inerting gas flow means including chamber means for enclosing said areas and flowing inerting gas completely around said areas, said chamber means including plug means forming a wall portion of s
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