The factory, located at Mourmelon was temporarily forced to close when the outbreak of World War I saw most of its workers conscripted into the army, but Borel re-opened in November 1915 to produce military aircraft for France under licence from other manufacturers including Caudron, Nieuport and SPAD.
Borel | Émile Borel | Établissements Jean-Pierre Moueix | Borel set | Borel measure |