It is the trade marks of a serial material products of e . i . du pont de nemours company to specially defend strong tyvek , is this kind specially defended strongly 特卫强tyvek是杜邦公司一系列片材产品的商标,这种名叫特卫强
4.
It is the trade marks of a serial material products of e . i . du pont de nemours & company to specially defend strong tyvek , is this kind specially defended strongly 特卫强tyvek是杜邦公司一系列片材产品的商标,这种名叫特卫强