Conical coal pick for tunnelling machine

摘要

#$%^&*AU2012101278A420120927.pdf#####Abstract A coal pick wherein the shank and bit are forged into a whole piece, a sleeve is fixed on the outside of shank by a retainer which embeds in a ring groove on the shank, said bit characterizes in a tungsten carbide tip fixed by brazing welding.1 2 34 F gi Fig2