| CPC B23Q 1/26 (2013.01) | 20 Claims |

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12. A work piece holder, comprising:
a support wall extending along an arc path; and
shelves connected to an inner side of the support wall, arranged in parallel and each of the shelves comprising:
a support baffle extending along the arc path; and
a pair of elevating elements disposed on the support baffle and the pair of elevating elements being arranged symmetrically, wherein each of the elevating element is movable to have a changeable tilt angle with respect to the support baffle.
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