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Nuveen Municipal High Income Opp Fund is a diversified, closed-end management investment company. The company's investment objectives is to provide current income exempt from regular federal income tax by investing predominantly in a portfolio of municipal obligations issued by state and local government authorities or certain U.S. territories. It seeks to provide attractive monthly tax-free income, portfolio diversification and attractive after tax total returns. The fund invests in municipal securities that are exempt from federal income taxes.
Calumet Inc is a producer of specialty products, including base oils, specialty oils, solvents, esters, and waxes, as well as a variety of fuel and fuel-related products, including asphalt and heavy fuel oils. The company manufactures, formulates, and markets a variety of specialty branded products to customers in various consumer-facing and industrial markets.