目的语言: 英语
After observation of the filter sleeves by Mr Boni and Mr Pechmann on December 19, 2006, we noted the following points:
2 sleeves have a "grey" abnormal color,
The PTFE thread has disappeared,
The seams lengthwise are damaged from the bottom to 80 cms up.
The thread in the high part has preserved its properties.
We asked an independent laboratory for an analysis of the sewing thread. He confirmed that we had put the PTFE thread on well.
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