ELD had associations with some smaller French publishers, which were probaby owned by ELD eventually, examples are
Charles L’Hôpital and
Veuve Durnand.
There are also ELD cards associated with Rostand's play "Chantecler", some of which also have a GPL logo,
see here
early card with E.L.D. logo
ELD Delaunay-Belville 1904
ELD advertising card
ELD 5015. The logo here is just embossed.
ELD 8086