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{{expand}}In the winter of 1990–91, [[Nine Inch Nails]] embarked on their second headlining North American tour, dubbed the '''Sin Tour'''. The tour is These dates were part of the [[Pretty Hate Machine Tour]] series. Opening acts were [[Related bands and artists#Chemlab|Chemlab]], [[Related bands and artists#Die Warzau|Die Warzau]], The Adults, Grotus, Fixed Image, Sweat Engine, and Ethyl Meatplow.