It was a French manufacturers of high and mid range steel tubing for road bikes. I see a early 80's frame recently with "aero 7" Camus tubing. Looked quite nice and had ovalized aero tubes. Anybody ridden Camus frame?
Mrs non-fixie's Méral is made with Camus tubing, I believe. I haven't ridden it myself, but it is her favorite bike (and she does have some other nice bikes).