setting-out of cross line through shaft center
A line used as both sterile and maintaining line
agonic line {agonic line of no declination}
Dual purpose line with nucleic male sterile line
Fault Cutoff Line Allan Line
Male sterility line and maintainer line
velocity line of arc line short band
100 t Shaft Arc Furnace
45Mn2 transmission shaft
a mechanical system of a shaft and two rolling bea