| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-side nail having a nail shape being the minimum required for joining thick woods mutually and securely and to provide a construction tool. SOLUTION: This nail is provided with a collar at the center of the nail and has such a shape that both ends are pointed to insert easily. An outer cylinder is used as a tool for driving the nail. The outer cylinder includes a disposal type outer cylinder provided in the nail always and a steel outer cylinder allowing reuse and having durability. COPYRIGHT: (C)2006,JPO&NCIPI
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