| 摘要 |
A free-wheeling rotary table comprising a base member, a horizontally disposed rotatable table member adapted to support an object for rotation about a generally vertical rotational axis, antifriction bearing means on one of the members arranged generally coaxially of the rotational axis, and a bearing surface on the other of the members engageable with the bearing means and defined at least in part by an imaginary sphere having its center located along the rotational axis of the table member.
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