When did the profession of Slubber Doffer become obsolete?

The profession of Slubber Doffer, which involved managing the spinning of wool and cotton in textile mills, became largely obsolete by the mid-20th century. Advances in technology, particularly the introduction of automated machinery and changes in manufacturing processes, rendered the role unnecessary. By the 1950s, most textile operations had transitioned to more efficient methods, leading to the decline of this occupation.