See Thibouville under the Clarinet Manufacturing History page and the metal clarinet made by Thibouville also.
See also the very cool Albert System ‘The Specialty’.
Brevete S.G.D.G means "Patented but not guaranteed by the French Governtment."
Jerome Thiboville-Lamy (Lamy was his wife's name) & Co. had a history of making stringed instruments - violins, et al. but they went into manufacturing clarinets and in some instances, Saxophones on demand as France during those time was rife with music workshops.