| 摘要 |
<P>PROBLEM TO BE SOLVED: To train muscle power by utilizing the restoration force of a coil spring and to also demonstrate a massage effect by contact with a human body. <P>SOLUTION: On the surface of the middle part in the winding axial direction of the coil spring, a plurality of recessed and projected parts 2 which can be brought into contact with the human body are formed. <P>COPYRIGHT: (C)2007,JPO&INPIT |
