| 摘要 |
Filing material feeder pipe equipped with non-abrasive internal tubing, ductile external tubing and ring-shaped flanges, characterised in that non-abrasive tubing consisting of 2 sleeves (2) with seats (6) on their ends, pressed into external tubing (1), while ends of the external tubing (1) are reinforced with welded collars (5) with ring-shaped flanges (3 and 4) welded on.
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