How did the job of a Pit Brow Lass evolve over time?

The role of Pit Brow Lasses, women who worked above ground in coal mines, evolved from manual labor in the 19th century to more skilled positions by the early 20th century. Initially, they sorted coal and removed debris, but as mechanization increased, their roles shifted towards operating machinery and managing processes, reflecting broader changes in labor and gender roles in mining.