[2] In the 1860s, a photo studio belonging to Michel, Jean, and Georges Berthaud was established in Paris' 9th arrondissement at 9 Rue Cadet under the name "Maison Hélios".

[3][4] English photographer Eadweard Muybridge was trained in photography by the Berthaud brothers and was authorized to use their studio as a contact address in 1862.

[9] Expanding their photography operations to eight cities in France, Berthaud and Berne-Bellecour planned a Troyes branch in 1868 under the name "Hélios."

On 7 December 1868, the Commercial Court ruled in Lancelot's favor, citing his prior use and the plaintiffs' lack of trademark registration.

[13] Berthaud was appointed to the organization committee of the International Congress of Photography in 1888, with the event occurring in Paris the following August.

[17][18] He was appointed to the role of vice president for the 1897 Brussels International Exposition's Organization Committee for the photography section.