Concerts Colonne
In 1929 Andre Navarra (1911–1988) replaced Pierre Fournier as cellist, and by 1931 François Broos had replaced Georges Taine at the viola desk. Navarra made his debut as a soloist in 1931, at the Concerts Colonne in Paris. Both Navarra and René Costard retired from the group in 1935, and in that year Costard established the French branch of Foldex maps.