User blog comment:FortunePayback/Penny's Faction/@comment-3257939-20140612034127/@comment-3146930-20140612115054

The Schnee Dust company does more then make Dust; they also make toothpaste, lol. But seriously, they could have branched out from their original goals of harvesting Dust into other ventures. Obviously Dust is their main money maker, as it is in the name of the company, but they are also filthy rich and could pay anyone to build anything they wanted. If the Schnee Dust Company has had a target on their back from their creation, a smaller branch of the company may have been built specifically to combat threats to the company. With the amount of power Penny has shown, I would say they did a pretty good job.

I'll admit it could be another company that makes the robots, but so far the SDC has been the only major company mentioned in the show. Not to mention they are the main target of the White Fang, who are working with Roman to collect Dust, which will lead to the completion of Cinder's plan. It would only make sense to have members of the SDC appear.