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Precision Optics Corp Inc is engaged in designing, developing, and manufacturing advanced optical instruments. It manufactures medical products such as endoscopes and endocouplers which incorporate various optical technologies for use in a variety of minimally invasive surgical and diagnostic procedures. The company also produces endoscopes for various applications as well as designs and manufactures custom optical medical devices to satisfy customers' specific requirements. In addition, the company manufactures and sells components and assemblies specially designed for industrial and military use. The company earns the majority of its revenue from the United States.
Tungray Technologies Inc is an engineer-to-order company that provides custom industrial manufacturing solutions to original equipment manufacturers in the semiconductor, printer, electronics, and home appliance industries. It predominantly generates revenue through the manufacture of custom industrial manufacturing solutions, direct drive and linear DC motors, and induction welding equipment. Geographically, the company generates a majority of its revenue from Singapore and the rest from China.