| http://www.w3.org/ns/prov#value | - otatably provided in such a manner as to be orthogonally intersected to each other, each having a peripheral surface portion which penetrates through the mount hole 70 and is slidably contacted with a lower peripheral surface of the track ball 71, slit disks 73 each of which is coaxially engaged with a shaft of each of the slip rollers 72 and has two rows of slits (not shown) formed thereon concen
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