| 摘要 |
PROBLEM TO BE SOLVED: To realize close adhesion of objects conventionally prevented due to protrusion of a head of a screw after tightening the screw, and prevent danger in a place where a hand touches it. SOLUTION: A cutting edge for shaving iron is attached or welded to a back side of the head of the screw irrespective of large and small flat type tapping screws to shave an inlet of a screw hole widely and make a board and the head of the screw flat. COPYRIGHT: (C)2003,JPO
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