 It is also a major transportation center for the transshipment of coal, taconite, agricultural products, steel, limestone, and cement.In recent years it has seen strong growth in the transshipment of wind turbine components coming and going from manufacturers in both Europe and North Dakota and of oversized industrial machinery manufactured all around the world and destined for the tar sands oil extraction projects in northern Alberta.Duluth has attracted several new engineering firms including TKDA, Barr Engineering, LHB, Enbridge and Lake Superior Consulting, as well as new start-ups in various fields, including Loll Designs, an eco-friendly furniture company, and microbrewery Bent Paddle.