Karl-Gerät
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"Karl-Gerät", also known as Mörser Karl, was a World War II German self-propelled siege mortar designed and built by Rheinmetall. Its heaviest munition was a 60 cm diameter, 2,170 kg shell, and the range for its lightest shell of 1,250 kg was just... Wikipedia
Breech: Horizontal sliding-wedge
Crew: 21 (gun commander, driver, assistant driver, 18 gunners)
Elevation: 55° to 70°
Engine: Daimler-Benz MB 503 A gasoline or Daimler-Benz MB 507 C diesel; 580 hp (590 PS; 430 kW)
In service: 1941–1945
No. built: 7
Operational range: 42 km (26 mi) (gasoline engine); 60 kilometres (37 mi) (diesel engine)