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RENN Fund Inc is active in the financial services domain. It is a closed-end management investment company formed to provide return through capital appreciation and income by a long-term, value-oriented investment process that invests in a wide variety of financial instruments, including but not limited to, common stocks, fixed-income securities including convertible and non-convertible debt securities or loans, distressed debt, warrants, and preferred stock, exchange-traded funds and exchange-traded notes, and other instruments. It invests in various industries, including communication services, surgical and medical instruments and apparatus, Oil and Gas, medical chemicals, botanical products, and others.
Electro-Sensors Inc is engaged in manufacturing and selling a variety of monitoring systems that measure actual machine production and operation rates, as well as systems that regulate the speed of related machines in production processes. Its speed monitoring systems compare revolutions per minute or speed against acceptable rates as determined by a customer. It also includes a line of products that measure production counts or rates, such as parts, gallons, or board feet, alarm systems, tachometers, and other devices that translate impulses from the sensors into alarm signals, computer inputs, or digital displays that are usable by the customer.