Assertion: tank's armament | /r/HasProperty | the 120mm l55 smoothbore gun
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Source sentences:
text: The main armament of Leopard 2A6 includes the 120mm L55 smoothbore gun which was developed by Rheinmetall Waffei Munition of Ratingen, Germany to replace the shorter 120mm L44 smoothbore tank gun on the first version of Leopard 2.