| http://www.w3.org/ns/prov#value | - an aperture at a center thereof; a fourth lock hole is formed on a periphery of the locking plate; a second screw serves to lock the locking plate to the first lock hole; and a driving element is a step motor and a periphery thereof has a plurality of fifth lock holes; the driving element is locked to the second lock hole by screwing screws to the fifth lock holes; a driving block is formed on a c
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