LST EN 50216-4-2015 Power transformer and reactor fittings - Part 4: Basic accessories (earthing terminal, drain and filling devices, thermometer pocket, wheel assembly)
2015LST EN 50216-4-2015 Power transformer and reactor fittings - Part 4: Basic accessories (earthing terminal, drain and filling devices, thermometer pocket, wheel assembly)
2005GB/T 18851.5-2005 Non-destructive testing.Penetrant testing.Part 5:Means of verification
2003LST EN 50216-4-2003 Power transformer and reactor fittings. Part 4: Basic accessories (earthing terminal, drain and filling devices, thermometer pocket, wheel assembly)
1999JB/T 9216-1999 Methods for controlling the quality of liquid penetrant materials