Near the end of Dead Money, Elijah states he has been to the Big Empty. There, he found hologram technology among other scientific marvels. He also explicitly states there were Securitrons there. We have never in a Fallout game seen Securitrons that were not direct property of Mr. House. I don't think he even created them for commercial reasons. There are no billboards and poster advertisemants for them, and they are never under ownership of civilians or groups like the BoS or the Enclave. Protectrons, Mr Handies/Gutsies, Robobrains and even Sentry Bots are under ownership of several people. Securitrons are not, ever. There's a possibility Mr. House created the Securitrons for himself only. If so, there being Securitrons at the Big Empty means House had/has a stake in it. And if that's the case, he may even have created the entire facility.
Also, remember the big picture of Mr. House in the House Resort at Camp Golf? He is shown standing before (presumably) a giant robot. Only his feet/legs are shown, and they are about the same size of Liberty Prime's. Not to mention Mr. House's company RobCo Industries built Liberty Prime in a joint venture with General Atomics International. He could've used similar technology building the robot partly shown on the Camp Golf picture. If House had a major stake in the Big Empty facility, we can't rule out the possibility of this robot being present there.
Anyway, that's my two cents. I'm curious about the full extent of Mr. House's empire, and I'm even more excited about the Big Empty if Mr. House is one of the technological minds behind it.
