| http://www.w3.org/ns/prov#value | - The apparatus of claim 9, further comprising a mobile carriage, a turntable mounted on said carriage, and a support for said carriage, said converting means being mounted on said turntable and including means for maintaining the polygonal body in a predetermined orientation with reference to said turntable, said carriage being movable relative to said support between a first position in which said
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