| http://www.w3.org/ns/prov#value | - Referring now to the drawings, particularly to the FIGS. 1 to 2, the apparatus there shown comprises a static base structure 10* which carries on a bearing 12* a rotatable turntable or drum unit 14*. (In this specifation, an asterisk shown in association with a reference number indicates a first mention of that reference number.) The drum unit includes upper and lower annular plates 16*, 18* space
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