DEATH OF ApPLICANT 26. In case of the death of an applicant or joint owner for the grant of a patent after the date of his application, and befo'-re the grant of a patent has been effected, the Registrar may. on being satisfied of the applicant's or joint owner's death, enter in the Register, in place of the name, address and nationality of such deceased applicant or joint owner the name, address and nationality of the successors in title or personal representative of the applicant or joint owner on such succession being proved to the satisfaction of the Registrar. DrSCRETIONARY POWER 27. Except as otherwise provided in these Rules, be fore exercising any discretionary power given to him by the Act or these Rules adversely to any applicant for the grant of a patent, the Registrar shall give at least ten days notice to the applicant of the time when he may be heard. AMENDMENTS 28. If the Registrar thinks fit, any document or drawing relating to an invention may be amended, and any irregularity in procedure may be rectified, on such terms as the Registrar may direct. 29. Where a certificate is required for the purpose of obtaining a patent abroad, or for any legal proceedings, or other special purpose, as to any entry, matter or thing \vhich the Registrar is authorised by the Act or these Rules to make or do, the Registrar may, on the lodging of a request on Form 14 give such certificate which shall also specify on the face of it the purpose for which it has been issued as aforesaid. COpy OF PATENT 30. An application for a copy of a patent shall be made on Form 15 and shall be accompanied by evidence setting out in full and verifying the circumstances in which the original patent \vas lost or destroyed or cannot be produced. EVIDENCE BEFORE REGISTRAR 31. Where under these Rules, evidence is required to be filed, it shall be by statutory declaration or affidavit, unless otherwise expressly provided in these Rules.