Paris Métro Line 13 (opened as Line B; French: "Ligne 13 du métro de Paris") is one of the sixteen lines of the Paris Métro. It was built by the Nord-Sud Company before becoming Line 13 when the Nord-Sud was merged into the Compagnie du chemin de fer métropolitain de Paris (CMP) in 1930. Line 13 was extended in 1976 to reach the northern end of Line 14, which was then absorbed into it. The number 14 was eventually reused for a new line in 1998.