From what I understand about the "Lum" name. Due to the number of designs he had licensed out to companies, over 10 companies (many overseas) last count (from a buddy who is close to the Lum family), he incorporated and then set up a trust. Any of his designs (from what I understand there are over 100) can be licensed to a company, and licensing fees are paid to his heirs. Bob Lum was the innovator of the modern american Tanto fixed blade. He is up there with Loveless when it comes to licensed designs.
Here are a few companies I know that have licenses:
Timberline/Neely
Benchmade
Spyderco
Blackwater
Gerber
Seki
Coldsteel (unknown if their tanto design was a rip from Bob or he permanently sold them the rights).
The rest are overseas, I used to have the list but can't find it.