tower crane hoist control box brand: SYM, SCM, YONGMAO, ETC model: 55RCS and 70RCS Hoist control box for 70 RCS and 55RCS for tower crane tower crane part potain tower crane1.Brand :Potain,SCM,SYM,Yongmao.etc. Our main products are France Potain type and QTZ type tower crane parts, mast section. anchore frame, fixing angle, pin, bolt, various mech, assembly and spare parts, control box, ...