Wikipedia definition
1. Nilgiri class frigateThe Nilgiri class frigates are updated versions of the Leander class, designed and built for the Indian Navy by Mazagon Dock Limited in Mumbai. Six ships were built between 1972-81. Vessels of the class formed the 14th Frigate Squadron. The lead ship INS Nilgiri was the first major warship to be built in India in collaboration with Yarrow Shipbuilders of the United Kingdom The class and its lead ship, INS Nilgiri are named for the Nilgiri Hills.
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