An interesting rabbit-hole I fell into the other day, was researching the French company Vantiva, the maker of my ISP's fiber ONT (and many previous cable modems I've had from other ISPs, under their previous names Technicolor / Thomson.)
If you trace out why Vantiva makes modems, it turns out that it's because all the patents for cable modems / coaxial carrier-network signal modulation and amplification were filed by RCA; GE bought RCA; and then GE divested its own + RCA's consumer-electronics businesses (including these patents!), selling that unit to Vantiva.
Presumably, cable modems were the kind of industry that only support a few big players, because there's not enough margin there after licensing costs are paid to patent-holders. The default winner of such a market would be a vertically-integrated player who holds those patents and can therefore make cable modems without licensing them.
That player was RCA (American); then GE (American); but is now Vantiva (French).
Vantiva released the cable-modem patents into a free IP sharing consortium kind of thing 15+ years ago now; but only once they already had an extremely dominant position in the space, with existing contracts with pretty much every ISP, such that they could be assured continued dominance even without the weight of licensing pressing down on all their competitors' backs.
Whenever I read about tech IP, I run into similar stories to this one. Some American company owned some tech innovation, but sold it to an overseas buyer some time in the late 80s / early 90s. And now it's not worth it to make that thing in America any more, because doing so would require licensing that IP from its current overseas owner.
(Perhaps, if America wants to be competitive, the government should encourage American firms with lots of free cash to [re-]acquire foreign companies that hold especially-valuable IP. Then, at least the IP incentives would lean in favor of vertical integration of manufacturing within the US.)