J. Courtois in not part of DFC

I was looking for information on my crystal radio with a "J. Courtois" tag on it and assumed it was the Courtois in Deshayes Freres et Courtois (D.F.C.) but discovered that the Courtois in DFC was an M. Carlos Courtois.  Here is a link to the website where I discovered this: La marque Deshayes Frères et Courtois - D.F.C.doctsf.com.  It's at the bottom of the page.

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