B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/928
B29D 23/00 (2006.01)
Patent
CA 1059720
ABSTRACT OF THE DISCLOSURE The present invention provides a method for manufactur- ing plastic components for use in a drainage system comprising, molding a tubular member having a hollow interior, the tubular member being formed with closed ends, forming an inwardly directed helical thread in the exterior surface of the tubular member between the ends thereof, and forming a severance line on the exterior surface proximate the ends of the member.
259870
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