로프해치

Rope Hatch

롤러

Roller

롤러 굽힘시험

Roller Bend Test

롤러 전극

Roller Electrode

롤러 점용접

Roller-spot Welding

롤러진수

Roller Launching

롤러체인

Roller Chain

롤러통로

Roller Path

롤러페어리더

Roller Fairleader, Roller Chock

롤링각

Rolling Angle, Anglr of Roll