| 摘要 |
PROBLEM TO BE SOLVED: To resolve a problem that a nail loosening or dropping is caused by vibration, impact, or climate conditions because conventional nails are vertically driven in lumber. SOLUTION: The nail prevents loosening or dropping by being deflected in the inside of lumber and at the same time, a needle-like projection digs into the inside of lumber and works so as to increase strength. By this way, the nails, once driven, never cause loosening nor dropping. COPYRIGHT: (C)2005,JPO&NCIPI
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