Bear in mind, the Japanese copied a lot. Ever see a Japanese Les Paul guitar or Strat?
Nah I'm sure nobody has

The CTS used in the Santana was widely copied.

At the very end of Trusonic Utah was building their bookshelf speakers. I have a pair...Utah woofer and Fostex tweeter. So at least there was SOME business contact between the two I can document.

The 60's and 70's saw very similar stuff made in both the US and Japan.

Anywhoo, the horns were definitely made first by Jensen and Heppner and later by the Japanese.

The reason I am so sure the Magnavox were never Foster is by the time Foster stuff came in consoles were pretty much vanished from the HiFi scene.

I have seen literally hundreds of those horns, and have never seen a single Magnavox that had any Foster/Fostex markings. Every one was Jensen or Heppner.

I'd really like to see the numbers on Pano's horns. I would be interested if I'm wrong...hey I'd learn something....but to date I have to be on record as no Fostex in Magnavox.

BTW here is something interesting...a 1970's teenager's bedroom pics...

http://www.rocketroberts.com/stereo/stereo.htm

And a parting shot- Utah was in Huntington Indiana.

But I have seen one very old Alnico compression driver labeled Salt Lake City...so in the early years they must have actually been in Utah...