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In this photo taken Tuesday, Oct. 23, 2018, visitors are tracked by facial recognition technology from state-owned surveillance equipment manufacturer Hikvision at the Security China 2018 expo in Beijing, China. The Chinese video surveillance company says it is taking concern about the use of its technology seriously following a report that the U.S. may block several Chinese surveillance companies from buying American components. (AP Photo/Ng Han Guan)

In this photo taken Tuesday, Oct. 23, 2018, visitors are tracked by facial recognition technology from state-owned surveillance equipment manufacturer Hikvision at the Security China 2018 expo in Beijing, China. The Chinese video surveillance company says it is taking concern about the use of its technology seriously following a report that the U.S. may block several Chinese surveillance companies from buying American components. (AP Photo/Ng Han Guan)

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