I think the "Triplex" is a triple bite lock up action that was marketed to artisan makers all across France....all it means is that the lock-up (fermenture) is is of a certain design (Triplex)...there is also a triple verrou Greener...and a triple verrou Purdey...and quad lock-up "Grip Helico" that was patented and designed by Verney Carron c1910...and the "Helice" lock-up...Triplex is just the lock-up design and does not indicate the finisher or finishing house...I can't remember who designed the Triplex, but if I run across it in my catalogs, I will post the info...
