CXH vs REFR Comparison

Mfs Investment Grade Municipal Trust is a United States-based diversified closed-end management investment company. Its investment objective is to seek high current income exempt from federal income tax, but may also consider capital appreciation. The fund invests a majority of its net assets, including assets attributable to preferred shares and borrowing for investment purposes, in tax-exempt bonds and tax-exempt notes.

Research Frontiers Inc is engaged in the development and marketing of technology and devices to control the flow of light. The company develops and licenses its patented suspended particle device light-control technology to other companies that manufacture and market the SPD-Smart chemical emulsion, the light-control film made from the chemical emulsion, the light-control panels made by laminating the film, electronics to power end-products incorporating the film, or lamination services for, and the end-products. The company's revenue source comes from the licensing of technology.