Assertion: medium tank | /r/HasProperty | based on the vickers six-tonner
Facets:
Source sentences:
text: A medium tank, based on the Vickers Six-Tonner, was the M-11-M13 series.
text: A medium tank, based on the Vickers Six-Tonner, was the M11-M13 series which had a very good 47 mm gun, but very thin armor.