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About The National System, Inc. The National System, Inc. (NSI) provides products and services to support clients' national marketing activities at the local level. The company serves large, market-leading clients in the automotive, wine and spirits, and retail/restaurant industries. NSI's services and programs help national marketers partner with retailers and dealers to ensure effective, consistent, brand-enhancing advertising. The company also provides services to validate that local marketing and advertising initiatives are consistent with the national marketers' expectations. Headquartered in St. Louis, NSI also has offices in Los Angeles, New York and Detroit.