Assertion: grinding stone | /r/CapableOf | encounter amongst the remains of a fifteenth-
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text: Grinding-stones commonly feature in the technical repertoire of iron production in Africa, for example, in the breaking up and mechanical fining of iron blooms on the Sukur plateau, Nigeria (David 1998), or encountered amongst the remains of a fifteenth- to sixteenth-century metallurgical workshop in Banda, Ghana (Stahl 2015).