John Graeme Houston,Robert Gordon Hood,Peter Arno Stonebridge,John Bruce Cameron Dick
申请号：
US10562471
公开号：
US08454675B2
申请日:
2004.05.24
申请国别(地区):
US
年份:
2013
代理人:
摘要：
An internal formation for a conduit. The formation has a longitudinally extending member adapted to extend along an inside surface of at least a portion of the length of the conduit. The longitudinally extending member has an asymmetric profile in a direction transverse of the longitudinal axis of the member.
