supply of set of filter elements for oil , set of filter elements for oil type main air compressors used in 3 phase emu rakes, consisting of 02 items viz. (1) filter element (inner) to elgi part no.070315520 - 01 n o/set (2) filter element (outer) to elgi part no.070315530 - 01 no/set [ warranty period: 30 mo nths after the date of delivery ] ] , set of filter elements for oil-free type main air compressors used in 3 phase memu rakes consisting of 02 items viz (1) filter element (outer) to elgi part no.b005702940 005 - 01 no/set (2) filter element (inner) to elgi part no.b005702940006 - 01 no/set [ warranty period: 30 months after the date of delivery ] ]