Production of the Type 91 began in 1991 and first-batch units were delivered into 1993. A second run, begun in 2007, is ongoing as of this writing (December 2017) and has produced the Type 91 "Kai" improved variant. The Type 91 Kai has since superseded the original Type 91 models in service. The Type 91 is also featured on the Kawasaki OH-1 "Ninja" light attack helicopter as its primary close-in air-defense weapon and makes up the basis for the Type 93 SAM launcher - both instances showcasing the weapon's versatility in vehicle-mounted form.
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