| http://www.w3.org/ns/prov#value | - The third main bearing portion 75 is on one end of the second moving frame 52 in the first direction X, includes two bearing pieces 75 a and 75 b provided with a predetermined amount of space away from each other in the second direction Y, and is provided on the lower surface of the second moving frame 52 in such a manner as to protrude downward.
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