【机械工程】螺旋弹簧离合器【机械工程】线圈离合器

ignition coil

未经使用的\nvirgin paper-tape coil【计】

transformer, choke coil step switch

deflecting focusing coil for camera tube

loop coil

moving-conductor loudspeaker【电子】;moving-coil loudspeaker【电子】;moving-coil speaker【电子】

aperiodical coil

coil