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Mk. I (Base-Initiating Fuze)
The Mk. I was a non-boresafe, non-delay, percussion (initiating) fuze, which was used with the projectile of the 37 mm Mk. I low explosive (LE) round. The Mk. I LE round was used with the 37 mm Model 1916 (M1916) light support gun, which used the 37×93R case. The Mk. I base-initiating fuze is essentially a Mk. IV base-detonating (BD) fuze without a booster assembly. The Mk. I fuze would be replaced by the M38 practice fuze, which differs...
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