Raymond Mailhat was born on 28 March 1862 in Saurat, the son of Jean Benjamin Mailhat, an illiterate shoemaker. After studying under Paul Gautier, Raymond became the director of the Secrétan company’s optics workshop in Paris on 1 January 1889. In 1894, Mailhat bought part of those workshops and established his own business. The Maison Mailhat manufactured a wide variety of equipment for both scientists and amateurs:
The company furnished optical instruments to the Paris Observatory, the Faculté des Sciences de Paris, the Bureau des Longitudes, the Camille Flammarion Observatory in Juvisy, the Société Astronomique de France, French government ministries, several observatories in France and in other countries, meteorological stations, bridge and road engineers, railroads, and mines. It won a gold medal at the Exposition Universelle in Paris in 1900. Mailhat became a member of the Société astronomique de France in 1888. At the time when he joined, he was a constructor-mechanic, residing at 5, passage Stanislas, Paris. Mailhat served on the society's management council in 1894 Advertisements for his company's telescopes appeared regularly in the pages of the society’s bulletin. The Maison Mailhat and its fellow Paris-based competitors the Secrétan and Bardou companies were among the leading French precision optics manufacturers of the early twentieth century. Mailhat telescopes and optical products were widely exported to Europe, the United States and even further afield. Ferdinand Quénisset used Mailhat lenses for early photographs of Mars in 1899 at the Camille Flammarion Observatory in Juvisy. On 1 April 1908, the company’s offices and workshops moved to 10, rue Emile-Dubois Paris, close to the Paris Observatory. The following year, Mailhat sold his company to Francis Mouronval. Mouronval continued to produce and sell telescopes under the Maison Mailhat name for seven years. Following Mouronval's mobilisation during the World War II, he publicly announced in 1916 that the Mailhat-Mouronval company was closed "for the duration of the war". This closure appears to have been definitive. During the war, Mailhat served as ‘’Officier de l’administration de 3e classe territorial’’ in the Service des fabrications de l'aviation. For his contribution to the war effort, he received the Légion d’Honneur in 1918. Mailhat died on 22 April 1923 at his home at 13, rue Boileau in Montrouge.
