The provisions of Service Tax were introduced by the Finance Act, 1994. However, the same at that time applied only to a limited number of items and not to all forms of service. Subsequently, from time to time a large number of services were brought under the scheme by amendment of the provisions of the Finance Act, 1994. Under Section 65 (105) (zzzza) „taxable service‟ means any service provided or to be provided to any person by any other person in relation to the execution of a works contract, excluding works contract in respect of roads, airports, railways, transport terminals, bridges, tunnels and dams. The said provision was brought into effect from 1.7.2007. It is not in dispute that the work in question under the agreement between the petitioners and the Board was squarely covered by the definition of taxable service under the aforesaid provision. The work itself continued to be carried out from a prior period till 9.12.2009 and for the period from 1.6.1997 the service provided is under the provisions of the Act liable to payment of service tax.