| 摘要 |
<p>FASTENER FOR ATTACHMENT TO METALLIC STRUCTURES A fastener apparatus having an elongated body with a hardened substantially non-bendable penetrating portion at one end which can be driven to a predetermined depth in metallic structures by a fluid or electrically operated driver or by a manually operated hammer and which forms a mechanical lock with the metallic structure to resist twisting, bending and extraction therefrom.</p> |
