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Euro Tech Holdings Company Limited primarily distributes water treatment equipment, laboratory instruments, analyzers, test kits and related supplies, and power generation equipment to commercial customers, and governmental agencies in Hong Kong and the People's Republic of China. The company operates in two segments, Trading and Manufacturing, and Engineering. It sells analytical instruments, such as spectrophotometers, colorimeters, chromatographs, mass spectrometers, flow injector analyzers, automated sample preparation workstations, and atomic spectrometers; environmental monitoring instruments comprising air and water quality monitoring instruments; sample pre-treatment equipment; and general-purpose laboratory instruments consisting of water quality monitoring and analysis equipment. The company also distributes general testing and measuring equipment comprising multi-channel digital and analogue recorders, signal amplifiers, and calibration equipment for energy conservation, renewable energy equipment, power quality analyzers, and continuous emissions monitoring systems; and air pollution control systems to power plants, railway and aero-space industries, utilities, educational institutions, and telecommunications companies. In addition, it offers process control systems, including sensors, temperature and pressure gauges, power and energy consumption meters, flow meters, valves, temperature and pressure transmitters and control devices, and temperature and pressure calibrators, as well as moisture, power, energy, and harmonic analyzers; systems engineering services; and maintenance, installation assistance, and calibration services. Further, the company distributes programmable logic controllers, telemetry units, and supervisory control and data acquisition systems and software. Euro Tech Holdings Company Limited was founded in 1971 and is headquartered in Hong Kong, Hong Kong.

Yunhong CTI Ltd. develops, produces, distributes, and sells consumer products in the United States and internationally. It offers novelty products, including foil balloons; latex balloons under the Partyloons name; and toy balloon products, which include punch balls, water bombs, and balloons twisted into shapes, as well as other inflatable toy items. The company also offesrs packaging films and custom film products for food, and other commercial and packaging applications; and container products, as well as assembles and sells Candy Blossom product line. It primarily serves various retail outlets, including general merchandise stores, discount and drugstore chains, grocery chains, card and gift shops, party goods stores, and florists and balloon decorators. The company sells its products directly, as well as through a network of distributors and wholesalers, retail chains, and independent sales representatives. The company was formerly known as CTI Industries Corporation and changed its name to Yunhong CTI Ltd. in March 2020. Yunhong CTI Ltd. was founded in 1983 and is headquartered in Lake Barrington, Illinois.

SmartHeat Inc. does not have significant operations. It intends to seek potential assets, property, or businesses to acquire, in a business combination, by reorganization, merger, or acquisition. Previously, it was engaged in the manufacture and sale of heat pumps for commercial and residential applications. The company was formerly known as Pacific Goldrim Resources, Inc. and changed its name to SmartHeat Inc. in April 2008. SmartHeat Inc. was incorporated in 2006 and is headquartered in Shenyang, China. SmartHeat Inc. is a subsidiary of Northtech Holdings Inc.

QS Energy, Inc. develops and commercializes energy efficiency technologies in the United States and internationally. The company's energy efficiency technologies assist in meeting energy demands, enhancing the economics of oil transport, and reducing greenhouse gas emissions. Its intellectual properties include a portfolio of domestic and international patents, which have been developed in conjunction with and licensed from Temple University of Philadelphia, Pennsylvania. The company's primary technology comprises Applied Oil Technology, a commercial-grade crude oil pipeline transportation flow-assurance product that reduces crude oil viscosity by applying a high intensity electrical field to crude oil while in transit. It serves upstream and midstream energy sectors. The company was formerly known as Save the World Air, Inc. and changed its name to QS Energy, Inc. in August 2015. QS Energy, Inc. was incorporated in 1998 and is based in Tomball, Texas.

Universal Security Instruments, Inc., together with its subsidiary, engages in the design, marketing, and distribution of safety and security products for use in homes and businesses in the United States and internationally. It offers a line of safety alarms, including units powered by replaceable batteries, sealed batteries, and battery backup alarms; and smoke alarms, which include hearing impaired and heat alarms, as well as carbon monoxide alarms, door chimes, ventilation products, ground fault circuit interrupters, and other electrical devices under the UNIVERSAL and USI Electric trade names. The company provides its products to wholesale distributors; chain, discount, and television retailers; home center stores; catalog and mail order companies; electrical and lighting distributors, and manufactured housing companies; and other distributors. It also sells its products through independent sales organizations and sales representatives, as well as through its own sales catalogs and brochures, and website. The company was incorporated in 1969 and is headquartered in Owings Mills, Maryland.