hole enlarging and cooling drilling rod
hole measuring by double deck boning rod
position die for drilling hole of guiding-rod
Rod control and rod position indication system
shim follow-up rod (=shim rod)
split tie rod type tie rod linkage
sucker rod string rod column
up-and-down rod (upright rod)
A shrinkage method combining with medium-length hole and shallow hole
electron-hole liquid drop (=electron-hole droplet)
hole by hole blasting technique
hole by hole detonating