Held, the Appellant had awarded the contract for transportation of milk for specified period to contractors. Contractor neither the agent of the principal employer under Section 2(9)(ii) nor his employees worked under the supervision of Appellant. Contractors separately engaged workers for the work and workers were neither directly nor indirectly employees of the Appellant. Wages or salary of such workers were not paid by the appellant but by the contractor. Thus, in the present case and the persons employed by the contractor for loading and unloading of milk cans are not the persons employed on the premises of the Appellants' establishment. Appellants not liable to pay ESI contribution in respect of the workers employed by the contractors.