| http://www.w3.org/ns/prov#value | - Accordingly, parts that are identical to those in FIGS. 1, 2, and 8 will be assigned identical reference numerals and explanation thereof will be omitted. [0023] By interposing an adapter 11 between a main body 2 and a control unit 10, the wheel 4 and the control unit 10 can be placed in a position other than the center of the front face of th
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