The Japanese Type 10 Light Grenade Projector, or 'knee mortar,' was an early 20th-century infantry weapon designed to bridge the gap between hand grenades and crew-served mortars. Despite its name, the curved base was not for bracing against the knee but for ground stability. It featured a unique adjustable vent for range control and a lever-actuated firing pin, differing from typical mortars. Though largely replaced by the Type 89 for combat, the Type 10 remained in service for signaling purposes.
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