This standard is for oil for collection and underground drainage of groundwater and underground water created by applying centrifugal force and storage voltage.
KS F 4409-2002 history
2022KS F 4409-2022 Centrifugal perforated reinforced concrete pipes
0000 KS F 4409-2002(2017)
2002KS F 4409-2002 Centrifugal perforated reinforced concrete pipes
1982KS F 4409-1982 Centrifugal perforated reinforced concrete pipes