( 1 ) THE judgment will dispose of the following four appeals, they being APOT No. 646 of 2005, APOT No. 647 of 2005, APOT No. 648 of 2005 and APOT No. 649 of 2005. The questions of law and the issues involved in these appeals are almost identical. All the above appeals are filed by Coal India Limited, which is a company registered under the Companies act, 1956 and being the Government company, is a State. In all these appeals, the interim orders passed by the learned Single Judge of this Court in writ petitions filed by the respondent explosive companies are impugned. By that order, the learned Single Judge has issued an injunction restraining the Coal india from incorporating a supplementary clause in the principal contract. The following factual matrix would be necessary to appreciate the" controversies and the issues involved.

( 2 ) APPELLANT Coal India Limited owns and operates coal mines. All the coal mines were nationalized by Coal Mines Nationalization Act and that is how, the private ownership of the coal mines was brought to an end. Blasting is a necessary operation for excavating coal from the mines and for that Coal India needs explosives from the