| http://www.w3.org/ns/prov#value | - providing apparatus comprising a mandrel having a main axis, a non-rotating mass rotatably mounted on the mandrel and having a centre-of-gravity spaced from the mandrel axis, and an offsetting arrangement including a non-rotating offsetting portion rotatably mounted on the mandrel, coupled to the mass, and having an outer profile defining an offset relative to the mandrel axis, and a bearing porti
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