F Darne was the son and successor of Francisque, 1928-48, Interestingly during the Jallas era.
J Holtzer came from Alsace-Lorraine or close by, back packingin the early XIX. Founded a steel company who survived him merged with CAFL in 1953 then Creusot Loire. They were making the very best steel, sometime with their name sometime with a tradename. Commonly seen on Aiglon.
Francisque Darne end up to bought by Verney Carron. I guess after the war, in the 1950's
geoffroy

g gournet