These Regulations, in so far as material, read as follows "Section 65: APPEARANCE OF PARTIES : Every respondent who wishes to be heard in the proceedings shall within 14 days of the service upon him of the copy of the notice of enquiry, enter an appearance in the office of the Commission by delivering to the Secretary six copies of a memorandum stating that the respondent wishes to be heard in the proceedings and containing the name of his advocate having an office in Delhi or New Delhi and duly authorised to accept service of processes and the Secretary 1056 shall send one copy of the memorandum to the Registrar in case where proceedings are initiated under sub clause (iii) of clause (a) of section 10, and in all other cases to the Director of Investigation." "Section 67: REPLY TO THE NOTICE: Every respondent who has entered an appearance shall within four weeks of his entering appearance deliver to the Secretary a reply to the notice (5 copies) which shall include: (a) particulars of each of the provisions of section 38 of Act on which he intends to rely; and (b) particulars of the facts and matters alleged by him to entitle him to rely on such provisions." "Section 85: AMENDMENT OR REVOCATION OF ORDER ETC.: An application under sub section (2) of section 13 of the Act for amendment or revocation of any order made by the Commission in any proceedings shall be supported by evidence on affidavit of the material change in the relevant circumstances or any other fact or circumstances on which the applicant relies.