Polypropylene skeleton reinforcing internal-rib winding arrangement wall pipeline

The utility model discloses a gather the third of the ten heavenly stems rare skeleton reinforcing internal-rib winding arrangement wall pipeline is because this bellows passes through the direct spiral winding of multichannel cavity tubular product to hug closely fixed forming from one another, cav...

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1. Verfasser: DAI AIQING
Format: Patent
Sprache:eng
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