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The Lowell mills were 19th-century textile mills that operated in the city of Lowell, Massachusetts, which was named after Francis Cabot Lowell; he introduced a new manufacturing system called the "Lowell system", also known as the "Waltham-Lowell systems. Most textile workers toiled for 12 to 14 hours a day and half a day on Saturdays; the mills were closed on Sundays. Typically, mill girls were employed for nine to ten months of the year, and many left the factories during part of the summer to visit back home.