Seems there were two Berthier Boys: One Émile Berthier who had a hand in the Mannlicher-Berthier bolt-action rifles and carbines and antoher
André Virgile Paul Marie Berthier, who was a machine gun fanatic.


https://en.wikipedia.org/wiki/Berthier_rifle
Arquebusier Émile Berthier(Algerian Railroad Guy)

https://patents.google.com/patent/US1446635A/en
Arquebusier André Virgile Paul Marie Berthier(Neuilly-sur-Seine France)


Serbus,


Raimey
rse