Alvin,
To my knowledge just about every DWM barrel was made from Boehler steel. Boehler went on to supply barrel steel to Mauser afterwards. Since much of the documentation (especially from the DWM era) has been lost, it's impossible to say for certain that Boehler was the only (exclusive) supplier, though.
The Boehler marking disappeared, but they remained a supplier, no doubt about that. Boehler is still mentioned as supplier to Mauser in the 1945 CIOS intelligence report.
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