B - Operations – Transporting – 43 – L
Patent
B - Operations, Transporting
43
L
189/71, 18/937
B43L 5/00 (2006.01) B29C 57/00 (2006.01) B29C 67/00 (2006.01) F16L 47/06 (2006.01)
Patent
CA 1147670
Abstract of the Disclosure A plastic pipe comprises an inner wall and an outer wall, being integral with longitudinal partitions between them and bounding longitudinally extending channels and a circumferential, helically or non-helically extending groove, which groove has been formed by closing the channels by pressing channel wall parts onto each other. A retaining ring may be snapped into an external groove.
342894
Beune Joannes H.
Marissen Roelof H.
Mcfadden Fincham
Wavin B.v.
LandOfFree
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