Resin Impregnated Filter Paper M/S Clark Part No.Hf-Ps9 To Rdso Drg.No.Sk Dp-3909, Item 1, Alt.:Nil And Conforming To Rdso Spec.No.Mp.0.2600.25, Rev.01, July, 2021 To Manufacture Low Mean Pore Size Conventional Secondary Fuel Oil Filter.