[Stig Jarlevik]

OK Guys

Here is Charles Claveau's answer (who wrote the piece in Le Trait d'Union) and who is compiling his knowledge about French manufactures between 1919-45 in said magazine.
Quote
It is a clear relation between this strange aircratf and the "aviette" used by Henri Bréau in 1934 : the logo "Jarty" is exactly the same. This strange aircraft has been found by german troops in Villacoublay in july 1940. I think this strange aircraft is an "aviette" meaning a muscular airplane.
What is not explained, is who was "Jarty", the manufacturer or the sponsor for these two machines.
Unquote

I have replied with Franck's suggestion Jarty was involved with bicycles and perhaps even a bicycle manufacturer or bicycle dealer.

Cheers
Stig