Decision No. 1431/1999/QD-BGTVT dated June 15, 1999 of the Ministry of Transport on the installation and management of inland waterways navigation signal devices in ship clearances of river bridges
Decision No. 1431/1999/QD-BGTVT dated June 15, 1999 of the Ministry of Transport on the installation and management of inland waterways navigation signal devices in ship clearances of river bridges
