| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of a conventional crescent wrench that the operationality of a worm is not good and that the worm located at the center is an obstacle. SOLUTION: The operation of a worm is made by a knob connected with a cable and all the parts including the worm are housed in a cover of crescent wrench body. COPYRIGHT: (C)2004,JPO
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