| 摘要 |
The invention relates to improvements in methods of making fibrous substrates and in particular to such substrates containing an elongate impermeable element which can be easily verified through an aperture in the substrate. The substrate has an elongate element partially embedded therein and at least one discrete aperture extending through the fibrous substrate exposing at least a part of the elongate element, wherein at least one edge of the elongate element is exposed in the aperture(s).
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