I have to say, respectfully, after doing a little poking around, I am even more leery about the 'French thread file story' as the origins of JAWCO that Mr. Williamson, Jr. told 4.c.
As I said, it seems to willfully ignore the famous and popular aforementioned Reif & Nestor tool, patented in nearby Lykens, PA, for what sure looks to be an earlier version of the same exact tool that Jaw Mfg of Reading would later make.
Reif & Nestor had been around for a long time. They had tremendous street cred.
They trademarked the name NU-TRIX for a 4-sided thread file in 1927, patented the 4-sided file in 1928, re-upped the TM in 1938, and, as I said, made and sold them for decades prior to, during, and after WWII. Here's a postwar ad.
The earliest ads I can find for a Jaw Mfg thread file is 1955. It was a very small classifieds box.
When they started advertising it with photos, it was called the NU-THRED (admittedly, a much better name than Reif & Nestor's, but clearly a direct copy effort!) and it looks exactly like the NU-TRIX tool that Reif & Nestor were making for decades, in shape, function, and TPI sizes!
Here's the TM story in a nutshell. Reif & Nestor TM'd NU-TRIX in 1927, first use 1927. JAW TM'd NU-THRED in 1979, claims first use 1946, which I suppose might be the pre-JAW Krome compan Mr. Williamson mentioned. But in 1946 the NU-TRIX tool they obviously copied (again, not French in origin, but a from an old established company one county to the west in Pennsylvania) had already been around for 20 years.
It looks to me like the patent that ran out was Reif & Nestor's, not French, and they moved to an area where the resources and labor for making it were already existing.
I don't mean to be harsh. Strictly speaking, it all seems technically legal. And I appreciate Mr. Williamson even picking up the phone to take 4.c's call about the solid nut type chasers, which is very unusual. But it's a little fishy.