Engaging Of 02 Nos. Back Hoe Loaders Of Engine Capacity Not Less Than 48 Hp For Clearing Of Grid Jams At Wagon Tippler 1 And 2, Track Hopper 1 A And 1 B Grids And At Contingency Arrangement 1 And 2 On Round The Clock Basis For Arranging Uninterrupted Coal Feeding For A Period Of One Year From The Actual Date Of Commencement Of Work