The Type 98 20 mm AA half-track vehicle was an experimental Japanese self-propelled anti-aircraft gun. It had a single 20 mm Type 98 AA machine cannon mounted on the back section of a Type 98 Ko-Hi half-tracked prime mover.Taki's Imperial Japanese Army: Type 98 Half-tracked Prime Mover "Ko-Hi" The Type 98 Ko-Hi half-track was first manufactured in 1938.
The Type 98 half-tracks were considered "high speed" prime movers, capable of when loaded. It was powered by a diesel engine and had a crew of 15. The rear-mounted Type 98 20 mm AA autocannon was the most common light anti-aircraft gun of the Imperial Japanese Army.War Department TM-E-30-480 Handbook on Japanese Military Forces September 1944, p. 400. It had a range of , altitude of and could fire up to 300 rounds per minute.Taki's Imperial Japanese Army: Type 98 20mm AA Machine Cannon The Type 98 20 mm AA half-track vehicle was not mass-produced.
See also 20 mm AA machine cannon carrier Type 98 Ta-Se Type 98 20 mm AAG tank
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References
Imperial Japanese Army Page - Akira Takizawa