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Big Bertha

Howitzer
The 42 centimetre kurze Marinekanone 14 L/12, or Minenwerfer-Gerät, popularly known by the nickname Big Bertha, was a German siege howitzer built by Krupp AG in Essen, Germany and fielded by the Imperial German Army from 1914 to 1918. Wikipedia
Caliber: 420 mm (17 in)
Height: 4.5 m (15 ft)
Manufacturer: Krupp
Mass: 42,600 kg (93,900 lb)
Used by: German Empire
Variants: 30.5 centimetre Beta-M-Gerät