Satya Brata Sanyal, J.

This writ application is by All India Central Bank Officers Federation as well as by other Officers Association and their office bearers and some employees of the Central Bank for quashing Regulation Nos. 4 to 12, 19 to 23, 25, 32 and 41 of Central Bank of India (Officers') Service Regulations 1979 made in exercise of the powers conferred by section 19 read with sub-section (2) of section 12 of the Banking Companies (Acquisition and Transfer of Undertakings) Act, 1970 and circular No. CO/PRS/POL/80/1 dated 1.1.80 contained in Annexures 5, 5(i), 5(ii) and 5(iii) issued by respondent no. 3 pursuant to Regulation No. 12 of the aforesaid Service Regulations to each officer of the Bank and a writ in the nature of mandamus asking the respondents to forbear from altering or affecting the existing conditions of service, that is, pay scale, allowance perquisites.

2. Petitioners 3, 5 to 8, 10 and 11 were employed by the erstwhile Central Bank of India Ltd., prior to its nationatisation under the provisions of the Banking Companies (Acquisition and Transfer of Undertakings) Act 1970, hereinafter to be referred to as "the Nationalised Bank". Petitioners 4 and 9 a