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In page History of women in engineering:

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With the coming of the Industrial Revolution in the 19th century, new technology-based occupations opened up for both men and women.[citation needed] Sarah Bagley (1806–?) is remembered for her efforts to improve working conditions for women mill workers in Lowell, Massachusetts in the 1830s and 1840s, and for being one of the earliest women to work as a telegraph operator.[citation needed] Mathilde Fibiger (1830–1872), a Danish novelist and advocate of women's rights, became a telegraph operator for the Danish State Telegraph system in the 1860s.[citation needed]