Sen­sors to mon­i­tor sub­way el­e­va­tors

China Daily (Canada) - - CHINA -

The cap­i­tal city plans to in­stall more than 3,000 de­vices to mon­i­tor el­e­va­tors and es­ca­la­tors in its sub­way sys­tem by the end of this year, Mir­ror Evening

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