| 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 an 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 conce
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