A prosthesis replaces all or a portion of a natural facet joint on a vertebral body. According to the present invention, production of projections in a metal deposited-film can be effectively inhibited when forming the metal deposited-film of aluminum, zinc or the like on the surface of a work piece such as a rare earth metal-based permanent magnet. There is a first hole in the first enlarged end, and a second hole in a second enlarged end. First and second arms extend between the pressing portion and the two second fixing portions, respectively. The first and second parallelogram linkages are pivotally connected together by a first connector link and a second connector link. Generally, an institution or professional trader will know that they wish to trade when conditions are right, but will not be quite ready to submit an order.