Interesting. "Helice-Grip" was already a VC trademark as early as 1922, from their catalog for that year.
Concerning the "Helice" patent, I received a letter in 2002 from Claude Verney-Carron, president of the company. He wrote:
"Helice was the name of the locking system patented by my great grandfather Jean Verney-Carron at the beginning of the 20th century. When the patent expired and fell in the public field, a lot of gunmakers from Saint-Etienne adopted the system for their own use." He listed several brand names derived from "Helice" that were used by VC. One of those he listed was Heliduplex.
Last edited by L. Brown; 06/14/21 01:43 PM.