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Mk. IV (Base-Detonating Fuze)
The Mk. IV was a non-boresafe, non-delay, base-detonating (BD) fuze, which was used with the projectile of the 37 mm Mk. II high explosive (HE) round. The Mk. II high explosive (HE) round was used with the 37 mm Model 1916 (M1916) light support gun, which used the 37×93R case. The Mk. IV fuze is related to the Mk. I base percussion (initiating) fuze, which is essentially the Mk. IV without the booster assembly. The Mk. IV fuze would be r...
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