The 155 mm Rimailho Howitzer Model 1904TR (or just the 155 CTR) was a medium howitzer used by France during World War I. The name Rimailho comes from the designer of the gun Captain Emile Rimailho a French artillery officer who was also involved in the design and testing of the famous Canon de 75 modèle 1897. The gun was designed in 1904 and the TR in the name means 'Tir Rapide' or Rapid Fire in English.