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Nuveen Select Tax Free Income Portfolio 3 operates as a closed-end investment fund. Its primary objective is current income exempt from regular federal income tax, consistent with preservation of capital. The company was founded on May 28, 1992 and is headquartered in Chicago, IL.

SustainCo Inc., through its subsidiaries, provides infrastructure solutions and services in Canada. The company develops intelligent building technology, including the integration of disparate building systems for the provision of building automation and controls, HVAC mechanical services, real-time performance monitoring, and energy efficient retrofit and solutions. It also provides heating and cooling solutions for multi-residential and commercial buildings using energy from the earth. In addition, the company offers engineering services, building automation controls, mechanical and electrical installation, performance monitoring, and operations and maintenance services for multi-residential and ICI facilities. SustainCo Inc. was incorporated in 2008 and is based in Vaughan, Canada. The company is a subsidiary of Skyvest Aviation Inc.