TAIPEI, Taiwan—Taiwan’s defense technology agency has raised performance in a second version of its Teng Yun surveillance drone, bringing the developmental aircraft close to a likely service standard, a program official said. One unit of the second version has been built, but another could be added to the program, the official said. The agency, the National Chung-Shan Institute of Science and Technology (NCSIST), displayed the prototype at the Taipei Aerospace and Defense ...


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