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Aqua Metals, Inc. engages in reinventing metals recycling with its patented AquaRefining technology. The company provides a recycling solution for materials strategic to energy storage and electric vehicle manufacturing supply chains. Its AquaRefining is a low-emissions, recycling technology that replaces polluting furnaces and hazardous chemicals with electricity-powered electroplating to recover valuable metals and materials from spent batteries. Aqua Metals, Inc. was incorporated in 2014 and is based in Reno, Nevada.

Black Diamond Group Limited rents and sells modular space and workforce accommodation solutions. It operates through two segments, Modular Space Solutions and Workforce Solutions. The Modular Space Solutions segment provides modular space rentals to customers in the construction, real estate development, education, manufacturing, health care, financial, government, and defense industries in North America. Its products include office units, lavatories, storage units, large multi-unit office complexes, classroom facilities, banking and health care facilities, high security modular buildings, custom manufactured modular facilities, blast resistant structures, SmartSpace interchangeable paneled units, and storage containers. This segment also sells new and used space rentals units; and provides delivery, installation, project management, and ancillary rental items, products, and services. The Workforce Solutions segment provides workforce housing solutions, including rental of accommodations and surface equipment, and provision of turnkey lodging and travel management logistics services in Canada, the United States, and Australia. This segment also provides associated services, such as installation, transportation, dismantlement, and sale of used fleet assets. This segment primarily serves the resource, infrastructure, construction, disaster recovery, and education sectors. It also provides specialized field rentals to oil and gas industries. The company markets its rental assets, custom sales, and ancillary products and services through in-house sales personnel, its website, social media, web campaigns, and its digital marketplace. Black Diamond Group Limited was founded in 2003 and is headquartered in Calgary, Canada.

East Stone Acquisition Corporation does not have significant operations. It intends to effect a merger, capital stock exchange, asset acquisition, stock purchase, reorganization, or other similar business combination with one or more operating businesses or assets. The company focuses on businesses primarily operating in the financial services industry or businesses providing technological services to the financial industry in North America and the Asia-Pacific. East Stone Acquisition Corporation was incorporated in 2018 and is based in Burlington, Massachusetts.

Tarena International, Inc., through its subsidiaries, provides professional education services through full-time and part-time classes under the Tarena brand in the People's Republic of China. It operates through two segments, IT Professional Education; and IT-focused Supplementary STEAM Education Services. The company offers education courses in information technology (IT) subjects, such as Java, software testing, Linux and network engineering, data analysis and business intelligence, Web front-end development, Python, and network engineer courses; and non-IT subjects, including digital art, online sales and marketing, and visual effects-VFX, as well as live distance instruction, classroom-based tutoring, and online learning modules. It also provides robotics programming, graphical intelligent programming, NOI informatics Olympiad, Python artificial intelligence, high level hardware programming for secondary school, soft and hard programming enlightenment, creative programming starter, Python programming basics, and SPIKE starter and advanced under the TongchengTongmei brand. In addition, the company operates TMOOC.cn, an online learning platform for education courses and job placement training courses. Tarena International, Inc. was founded in 2002 and is headquartered in Beijing, the People's Republic of China.