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National Taper Pipe
earth.sc. 〔美国〕国家标准锥管〔螺纹〕
American National Taper Pipe
mech. 美制标准锥管
National Taper Pipe: 13 phrases in 8 subjects
Automobiles1
Aviation4
Earth sciences1
General2
Mechanic engineering1
Mechanics2
Oil / petroleum1
Technology1