Nice workshop and housing for it. I have a table saw that has some similar features to that one, but I've never known the maker. Perhaps it is a Pericaud. I'll have to look into that.
I have see the GD mark on some of the lathes and lineshaft, but that is all. Most(the ones that appear of later manufacture to me) are merely stamped "Made in France"
I've attached a few catalog scans if that helps! [ Guests cannot view attachments ]