The “manhole cover expert” of the Drainage Services Department (DSD), Mr LAI Chiu-leung, Sammy, talks about the features and functions of manhole covers.
The “manhole cover expert” of the Drainage Services Department (DSD), Mr LAI Chiu-leung, Sammy, talks about the features and functions of manhole covers.
The “manhole cover expert” of the Drainage Services Department (DSD), Mr LAI Chiu-leung, Sammy, talks about the features and functions of manhole covers.
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