"the 'Coupigny' modular synthesizer housed in the INA/GRM studios at RadioFrance in Paris and used extensively by some of the titans of
Update via Fabrique:
"It seems so as many composers in residence at GRM have recently requested to use it after it was unearthed by composer Christian Zanesi. Built in 66, it has been used by Parmegiani (La Roue Ferris), Bayle, Berio, Schaeffer... (in french) [and Googlish]
And it appears he also built a video effect unit used by Martial Raysse and other artists (Note : Francois not Francis might be a typo):
"1968 - Creation of the GRI (Groupe de Recherche Image) at the ORTF under the direction of Pierre Schaeffer. François Coupigny develops the "truqueur universel" (universal special effects device), which is used by Martial Raysse, Peter Foldès, and Jean-Paul Cassagnac for attempts at coloring the video image from black-and-white images."
Another article that mentions Francis Coupigny:
"The two most brilliant technicians who worked with Pierre Schaeffer were Francis Poullin, in the early 1950s, who developed the phonogène and the morphophone, and Francis Coupigny, in the 1960s, who created the console and the integrated synthesiser."