Assertion: siege mortar | /r/ObjectUse | used of up to one metre calibre
Facets:
value: from the 17th
type: TEMPORAL
Source sentences:
text: From the 17th to the mid 20th century, very heavy, relatively immobile siege mortars were used, of up to one metre calibre, often made of cast iron and with an outside barrel diameter many times that of the bore diameter.
text: From the 17th to the mid 20th century, very heavy, relatively immobile siege mortars were used, of up to one metre calibre, often made of cast iron and with an outside barrel diameter many times that of the bore diameter.