The skips (elevators) that once lifted about 4 tons of salt...
The skips (elevators) that once lifted about 4 tons of salt to the surface were eventually replaced with hydraulic hoists that can bring up as much as 19 tons,
The skips (elevators) that once lifted about 4 tons of salt to the surface were eventually replaced with hydraulic hoists that can bring up as much as 19 tons,