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Atlas Copco AB, together with its subsidiaries, provides productivity solutions. The company operates through Compressor Technique, Vacuum Technique, Industrial Technique, and Power Technique segments. It offers piston compressors, oil-free tooth and scroll compressors, rotary screw compressors, oil-free blowers, oil-free centrifugal compressors, gas and process compressors, air and gas treatment equipment, and medical air solutions primarily for use in the manufacturing and process industries. The company also provides oil-sealed rotary vane, dry, and liquid ring vacuum pumps; and turbomolecular and cryogenic pumps, as well as abatement and integrated systems for the semiconductor and scientific, chemical process, food packaging, and paper handling industries. In addition, it offers pneumatic, hydraulic, and electric assembly tools, as well as control systems and associated software for safety-critical tightening; self-pierce riveting tools, dispensing equipment for adhesives and sealants, and flow drill fastening equipment; material removal tools, drills, and other pneumatic products; and machine vision solutions for customers in the automotive and general industries. Further, the company provides portable compressors, boosters, generators, lighting towers, pumps, and construction and demolition tools for civil engineering, oil and gas, construction, manufacturing, exploration drilling, and demolition industries, as well as specialty rental services. It operates in North America, South America, Europe, Africa, the Middle East, Asia, and Oceania. The company was founded in 1873 and is headquartered in Nacka, Sweden.

Bunker Hill Mining Corp., a mineral exploration company, engages in the acquisition, development, and mining of mineral properties in Canada and the United States. It focuses on exploring for zinc, lead, and silver ores. It holds an option agreement to acquire interest in the Bunker Hill mine located in the Silver Valley, Idaho. The company was formerly known as Liberty Silver Corp. and changed its name to Bunker Hill Mining Corp. in September 2017. Bunker Hill Mining Corp. was incorporated in 2007 and is headquartered in Toronto, Canada.

Quantum Materials Corp. engages in the design, development, production and supply of nanomaterials, including quantum dots, tetrapod quantum dots, and other nanoparticles for a range of applications in televisions, displays and other optoelectronics, photovoltaics, solid state lighting, life sciences, security ink, battery, and sensor sectors of the market. The company was founded by Stephen Squires on January 9, 2007 and is headquartered in San Marcos, TX.

Quaterra Resources, Inc. engages in the acquisition, exploration, and development of mineral properties. It holds interest in the Groundhog and Quaterra's Yerington Copper projects. The company was founded on May 11, 1993 and is headquartered in Vancouver, Canada.

Santa Fe Gold Corporation, a mining company, acquires, explores, develops, and produces mineral properties in the United States. The company primarily explores for precious metals, gold, and silver deposits. The company was founded in 1991 and is based in Albuquerque, New Mexico.