China's surveillance firm Tiandy Tech founder has amassed a fortune keeping tabs on everyone

China's surveillance firm Tiandy Tech founder has amassed a fortune keeping tabs on everyone

Surveillance cameras manufactured by Tiandy Technologies in Tianjin. Photographer: Blake Schmidt/Bloomberg

Before he became a billionaire, Dai Lin would ride his bike to work, pedaling through the streets of Tianjin to the headquarters of Tiandy Technologies Co., the camera maker he built with support from China’s government.

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