to most of their contemporaries, who changed the numbers in their catalogues upon discovering forgotten stamps. In 1900, Yvert et Tellier associated with Paris stamp dealer Théodore Champion, who sold unused stamps from all over the world. He fixed the prices of the stamps sold by the company. After Champion's death in 1955, Pierre Yvert and the brothers Ladislas and Alexandre Varga bought Champion's company and the new firm continued to fix Yvert et Tellier's prices. In April 1913, Tellier sold his share of the company to Louis Yvert because of the loss of his young grandson. Due to their friendship, Yvert decided that the catalog would continue to be named Yvert et Tellier. During the 1920s and 1930s, Yvert prepared his two sons and his son-in-law to run the firm. Henri ran the printing works, his brother Pierre directed L'Écho de la timbrologie, and Jean Gervais took care of the publishing. Pierre Yvert's and Jean Gervais' two grandsons have run the company since the 1990s. Recent commercial history Since 2001 the apparition of the Dallay catalog has had a major effect on the French philatelist public by providing larger pictures of stamps and information not found in the Yvert et Tellier catalogs, such as the name of the artiste and/or engraver, first date of issue, use, etc. Yvert has been fighting on two fronts: it has successfully defended the rights to its numbering system, and it distributes a free CD-ROM with its French stamp catalog. Nevertheless, in March 2005, by urging of the French Conseil de la concurrence, Yvert agreed to sell the use of the Yvert stamp numbers to other publishers. In June 2006 Yvert et Tellier published a new catalog of French stamps, a cheaper pocketbook version containing just pictures and prices, as did Cérès, the second main philatelic publishing company in France. Genealogy of the Yvert family The Yvert printing company and Yvert et Tellier editor have been ruling mostly by members of the Yvert family. This family tree presents the people who managed these two companies since they were found in the 19th century. Eugène Yvert (circa 1794-1878), journalist, founder of the printer company in Amiens where he moved to create a legimist paper. │ └──> Henry Yvert (died 1885), company's owner after 1870, legitimist journalist too. │ └──> Louis Yvert (1866–1950), co-founder of the Yvert et Tellier catalog with Théodule Tellier. │ ├──> Henri