| 摘要 |
<p>An article of metal (10) has a data storage device or tag (12) embedded therein, the tag (12) being arranged for electrostatically and/or electromagnetically coupling to an external read/write sensor. The article may comprise a drill pipe used in boring in oil or gas exploration. The tag (12) stores data identifying the article and also historical data as to the previous working life of the article: the latter data can be updated.</p> |
