Your Yves Bellange is probably related to
Jacques Bellange - a very famous artist. There is quite a bit written about him and his expertise. Anyway, many times towns were named after a family that lived there....sometimes the other way around. Bellange is in Moselle, Department of
Rohrbach and it is usually referred to as Department 57. My family is from that same area in Moselle and they were glassmakers. I saw one reference to
Jacques Bellange making porcelain. I'd post the link however, I don't know if I can from this message - so...just google Bellange, Moselle and I think you'll find what you are looking for.