| 摘要 |
PROBLEM TO BE SOLVED: To provide a nail for preventing the cracking of a lumber possibly caused in driving or screwing the nail into the lumber. SOLUTION: A head 12 of a screwed nail 11 is provided with a disc plate portion 13 having a cross grooved portion engraved on the upper face. An annularly rimmed portion 14 in a sectionally V-shape is protruded throughout the peripheral edge on the lower face of the plate portion 13.
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