In a current Gunbroker auction for some “Diablo” brand 9mm, they show DKC 9X19 and PCM 9mm LUGER brass. I find that DKC is a known entity at the link below, but I don’t find much of anything on PCM.
DKC and PCM 9mm brass - General Ammunition Discussion
WMA +P+ 23 9mm nickel-plated brass - General Ammunition Discussion
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Magazine - Car Mechanics - 03.2018, PDF
9mm Round - General Ammunition Discussion - International
Defence Industries 9mm drill round - General Ammunition Discussion
Defence Industries 9mm drill round - General Ammunition Discussion
9mm parabellum (new to me) - General Ammunition Discussion
Blog - DKC Brass & Bullets
9x19mm by Panther Ammunition - General Ammunition Discussion