The association of revolving cannons/small arms and the French is as natural as "Mom and apple pie", or, in this case, "pie a la mode". You can point to the classic, 11 mm double/single action French Army revolver, Model 1873. Although Cochran and Hotchkiss were both Americans, the French fascination with revolving cannons provided both men with connections and/or investment francs and manufacturing facilities.
Lack of 37 mm Hotchkiss revolver cannons, designed in the 1880s, proved to be the downfall of the huge French Fort Douaumont in WWI during the Feb. 25, 1916 portion of the Battle of Verdun. Armed with about 15 stick grenades, Pioneer Sergeant Kunze, ( no relation), led a small, advanced element of the 24th Brandenburg Division of the Kaiser's Fifth Army into the fort's ditch and up the scarp, climbing on each other's shoulders and into the fort through an empty, revolver cannon port. They quickly captured the French artillerymen on the 75 mm and 155 mm guns, and, a few minutes later, the entire garrison, by locking the steel doors to the large meeting room where they all were attending a training lecture!
We don't have time to attempt a complete research of this question, but given the French propensity to invite revolving gun designers to their shores, we would not be surprised if an earlier example shows up someday in the armaments history of that country.
Regards,
Tracy and Mike