sentences:  Italian-built versions, however, mounted a single machine gun centrally.The type was also produced by the Nieuport-Macchi company of Varese, Italy, which built almost 900 HD.1s between 1917 and 1919; more than the parent firm.The new type was ordered into production as a possible replacement for the Nieuport 17 but became "superfluous" when it was decided to replace the Nieuport with the SPAD S.7 in the French air service.