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Luda Technology Group Ltd is a company that is principally engaged in the manufacture and sale of stainless steel and carbon steel flanges and fittings products and trading of steel pipes, valves, and other steel tubing products.
Smart Sand Inc. is a fully integrated frac sand company providing mine-to-well site proppant supply and logistics. It produces Northern White frac sand for enhanced hydrocarbon recovery in oil and gas wells. The company offers products like Smart System, SmartBelt, SmartDepot Silo, and SmartPath Loader. It is expanding into industrial markets, including glass, ceramics, and renewable energy, while its main revenue comes from sand sales and logistics.