I believe these are made by Weinmann. I have a similar crankset on my early 50's Gnome et Rhone. There is no brand name or other markings on them, but I once found chainwheels of the same type wrapped in Weinmann paper.
> From: BB <firstname.lastname@example.org>
> Date: Sun, 09 May 2004 21:07:36 -0700
> To: email@example.com
> Subject: [CR]RE: Early Alloy Cranks
> The crank in my photos must pre-date the introduction of the TA 'cotterless'
> cottered cranks, but it is the only truly cottered alloy crank I have seen.
> Surely there must have been others. If so, who and who is the maker of this
> Bryant Bainbridge
> Portland, Orygun