Tunnels Don't Have to Run Parallel to Level

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What company did Howard Hughes inherit from his family? Who did he work for? Who wanted his work? Was he smeared? Was he being poisoned?

Not an endorsement, per say…

… is this patent now public domain?

Oh, this tech is over 100 years old, what’s already down there? Elon?..

If they do exist, doesn’t that make them public utilities?

Think I’ve got Am Jur lying around for tunnels and subways,…. Hmm…