| 摘要 |
<p>An irrigation device, especially suited for trickle or drip irrigation comprises a tubular conduit (2) made by connecting opposite edges of at least two plies of plastics, embossing at least one marginal zone (3) of at least one ply to create a labyrinthine passage for liquid. The two plies may be obtained by lengthwise folding an elongated strip of material.</p> |
