I believe that Pelissier was the cycle parts brand of Max Steiner, a cycle parts distributor based in London, England. Max Steiner used the brand on derailleurs, brakes and hubs. There are two theories about the origins of Max Steiner's Pelissier brand.

• One theory is that the brand was named after Henri Pélissier, one of the greatest, and surely on of the most colourful, French riders of the 1920s. Henri Pélissier won the Tour de France in 1923, but was almost more famous for his ferocious feuding with Tour boss Henri Desgrange, for his wild claims about doping and for his even wilder private life. Wikipedia reports: "Pélissier's first wife, Léonie, despaired and shot herself in 1933. Three years later Pélissier took a lover, Camille Tharault whom he called Miete, who was 20 years his junior. He threatened her with a knife at least once. He was 46 and he hadn't raced for eight years. On 1 May 1935, he and Camille had a row in the kitchen of their Norman-style villa at Fourcherolles, near Dampierre, outside Paris. Pélissier lunged at her with a knife, cutting her face. She ran to the bedroom, opened a drawer and pulled out the revolver with which Léonie had shot herself. She ran back to the kitchen and found Pélissier waiting with the knife. At that moment both saw the other threatening and Camille pulled the trigger five times. Pélissier fell to the floor. A bullet had hit the carotid artery. His body was placed in the room where Léonie had killed herself."
• The other theory is that Max Steiner imported hubs branded Pélissier made by a company called Établissements Pélissier that was based in St-Étienne. This company was not associated with Henri Pélissier. Max Steiner then decided to use the Pélissier brand on other cycle parts that he also imported from Europe, most notably from other manufacturers in St-Étienne.

But getting back to derailleurs... I am only aware of one basic Pelissier derailleur model. This was a rebranded version of the Chemineau L’Izoard, which, of course, was manufactured in St-Étienne. Max Steiner appears to have introduced this derailleur at the 1930 Olympia Motor Cycle & Cycle Show in London and to have continued to sell it at least until 1934. I have been repeatedly told that there were other Pelissier derailleur models, but I have never seen any evidence of them.