| 摘要 |
PROBLEM TO BE SOLVED: To expand and contract a part or whole of a spring as a magnet wound on an iron for a coil freely as desired by flowing electric current. SOLUTION: The spring is made to perform rounded movement which cannot be performed by a gear or a motor is made so as to substitute for an artificial joint, artificial muscle in manufacturing a robot by freely enabling expansion and contraction of the spring as desired.
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