Operates a crane consisting of a turning metal tower which moves on rails, equipped at the top with a mobile jib (boom) or a fixed jib along which a car supporting the hoisting equipment moves.
Operates a crane mounted on wheels or crawler tracks which can be moved under its own power in any direction. Operators of excavating, pile-driving and similar machines are classified in unit group 9-74.
Operates power-driven hoisting equipment, usually consisting of mobile cage or platform, to raise and lower materials and workers employed on construction work.
Gives signals for movement of cage used to raise and lower men, cars and supplies between various levels and surface of mine and loads and unloads cage.