About the development of the 7.63 Mauser, 7.63 Borchardt, 9x19 and 9x25 you can probably write an entire book.
Basically, the Paul Mauser notes show that he himself was constantly in touch with developers at RWS, Rottweil and DWM Karlsruhe about the development of new, and experimental, cartridges and the powders needed to propel them. Of course, Max Duttenhofer, of the Rottweiler Pulverfabriken, was one of his main financers (and he had a thing or two to say at DWM, Loewe and RWS), so development wise it was one big family.
This is why I take the 'Mauser stole the Borchardt-design' story with a large pinch of salt, the communication between the companies involved was simply too efficient. Luger and Mauser faced the same problem, and came up with the same solution (probably suggested by a DWM ballistics expert). Removing the neck of their cartridges and coming up with a design that would not interfere with the safety of the barrels when rebored to 9mm.
I'm pretty sure that the real designer of the 9mm rounds was a DWM Karlsruhe engineer, not Luger or Mauser themselves.
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