Textbook of Automatic Pistols by R.K. Wilson, published in 1943 and I think it was republished again later on has some info about the 9mm Mauser. I believe most of that data was collected in the 30's. The book mentions D.W.M. as producing the cartridge for a brief time. The info may be old and out of date but it makes mention of a Submachine gun at the time in 1934 not yet produced but for a few examples called the Neuhausen that will be chambered in 9mm Mauser along with other calibers.
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Dave
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