Jain Industries got the trade mark 'Field Marshal' registered under clause (7),inter alia,for Flour Mills,Centrifugal Pumps,couplings for machines,pulleys included in class 7 and valves (parts of machines).The said registration was renewed for the periods 13.5.1972 and 12.5.1979; 13.5.1979 and 12.7.1986 and 13.7.1986 and 12.7.1993.Appellant is said to have commenced its business of manufacturing and selling centrifugal pumps also under the mark 'Field Marshall