law: 15. Transfer of service of existing employees of Coal Board.-
  (1) Notwithstanding anything contained in any other law for the time being in force or in any contract to the contrary, every officer or other employee of the Coal Board shall, on and from the appointed day, become an officer or other employee, as the case may be, of such Government company or organisation as the Central Government may, in writing, specify and shall hold his office or service in such Government company or organisation, as the case may be, on the same terms and conditions and with the same rights to pension, gratuity and other matters as would have been admissible to him if the Coal Board had not been abolished, and shall continue to do so unless and until his employment in the Government company or organisation is terminated or until his remuneration or terms and conditions of service are duly altered by the Government company or organisation, as the case may be:
  Provided that the tenure, remuneration and other terms and conditions of service of any such officer or other employee shall not be altered to his disadvantage except with the previous approval of the Central Government or without such approval, except as a measure of punishment, under the rules of the Government company or the organisation concerned.
  (2) Where any officer or other employee of the Coal Board becomes, under sub-section (1), an officer or other employee of any Government company or organisation, the period of service rendered, or deemed to have been rendered, by him under the Coal Board before the appointed day shall be deemed, for the purposes of fixation of pay and other emoluments, pension and other retirement benefits, to be the period of service rendered by him under the said Government company or organisation, as the case may be, as if the Government company or the organisation were in existence during the said period.