2009YD 5039-2009 Provisional Specifications on Enironment Protection for Engineering Construction of Telecommunications
1997YD 5039-1997 Specifications on Environment Protection for Engineering Construction of Telecommunications
YD 5039-1997 Specifications on Environment Protection for Engineering Construction of Telecommunications was changed to YD 5178-2009 Volume Drawing of Manhole and Handhole for Communication Conduit Engineering.