You're right, there were many other companies doing it too. General Electric, General Motors, Sylvania, etc.

That's not what I was saying. The foundational research that built the massive economic engine of the current US did not come from industrial research.

The "massive economic engine of the current US" is certainly the result of large companies' research. They have all been very open about that, so do you have any proof to the contrary?

More examples: IBM, Kodak, Xerox...