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American Power Group Corporation provides patented dual fuel conversion system for primary and back-up diesel generators, and mid-to heavy-duty vehicular diesel engines in North America and internationally. It operates through two segments, Dual Fuel Conversion Operations and Natural Gas Liquids Operations. The company's dual fuel conversion system is a fuel delivery enhancement system that converts existing diesel engines into engines, which run on diesel fuel and compressed natural gas or liquefied natural gas; diesel fuel and pipeline gas, well-head gas, or approved bio-methane; and diesel. It also provides flare capture and recovery services to oil and gas production companies. The company was formerly known as GreenMan Technologies, Inc. and changed its name to American Power Group Corporation in August 2012. American Power Group Corporation was founded in 1992 and is headquartered in Algona, Iowa.

Briggs & Stratton Corp. engages in the design, manufacture, and distribution of gasoline engines and outdoor powered equipment. It operates through Engines and Products segments. The Engines segment produces four-cycle aluminum alloy gasoline engines which are used in the production of walk-behind and riding lawn mowers, garden tillers, and snow throwers. The Products segment comprises lawn and garden power equipment, turf care products, portable and standby generators, pressure washers, snow throwers, and job site products. The company was founded by Stephen F. Briggs and Harold M. Stratton in 1908 and is headquartered in Wauwatosa, WI.

REGI U.S., Inc., through its subsidiary RadMax Technologies, Inc., designs, develops, and builds axial vane type rotary devices for civilian, commercial, and government applications. It offers RadMax compressed gas expander, a positive-displacement gas expander that captures kinetic and pressure-volume energy and converts it to rotational power in compressed gas expansion applications. The company also offers RadMax compressor that acts as a positive-displacement and centrifugal compressor; and RadMax combined function devices, which comprise two cams connected by a common driveshaft in a single housing. In addition, it offers RadMax positive-displacement pumps; and RadMax internal/external combustion engines. REGI U.S., Inc. was founded in 1992 and is headquartered in Spokane, Washington.

Terra Tech Corp. cultivates, produces, and retails medical and adult use cannabis products. The company also operates medical marijuana retail and adult use dispensaries, cultivation, and production facilities in California and Nevada under the Blüm name in California and Nevada. Terra Tech Corp. was founded in 2010 and is based in Santa Ana, California.