38 cm Belagerungshaubitze M 16
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The 38 cm Belagerungshaubitze M 16 was a super-heavy siege howitzer used by Austria-Hungary during World War I. Wikipedia
Designer: Skoda
Barrel length: 6.46 metres (21 ft 2 in) L/17
Caliber: 380 millimetres (15 in)
Shell: 750 kilograms (1,650 lb)
Used by: Austria-Hungary; Kingdom of Italy; Romania