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Aqua Metals, Inc. (AQMS)
Aqua Metals, Inc. engages in the business of applying a commercialized clean water-based recycling technology to develop recycling solutions for lead and lithium-ion batteries in the United States.
Smart Powerr Corp. (CREG)
Smart Powerr Corp. engages in the waste energy recycling business in China.
Concrete Pumping Holdings, Inc. (BBCP)
Concrete Pumping Holdings, Inc. provides concrete pumping and waste management services in the United States and the United Kingdom.