(2) Any other document so referred to shall, unless the Registrar otherwise directs, be produced to him with the application and a certified copy of any such document shall be filed. 21. An application under rule 19(1) of these Rules shall contain the name, address and nationality of the person claiming or stated to be entitled together with full particula~s of the instrument, if any, under which title is claimed or given. 22. Where the name of a person is entered in the Register as mortgagee or licensee, such person may on making an application for the purpose on Form 10 have a note entered in the register, that he no-longer claims to be mortgagee or licensee, as the case mav be. 23. (1) An application by a patentee for the alteration of a name, nationality, or address or address for service entered on the register in respect of his invention shall be made on Form 11. (2) Before acting on a request to alter a name or nationality the Registrar may require such proof of the alteration as he thinks fit. (3) If the Registrar is satisfied that the request should be allowed, he shall cause the Register to be altered accordingly. CORRECTION OF ERRORS 24. \Vhere an applicant for the grant of a patent or a patentee desires to correct any error, he shall make the application on Form 12. CANCELLATION AND SURRENDER OF PATENT 25. (1) Where a patentee desires to cancel his grant, he shall make the application in a written declaration accompanied by the patent. (2) Where the application relates to some of the claims only made by the patent the written declaration shall not be accompanied by the paten t; and the Registrar shall register the cancellation of the particular claims only and notify the applicant accordingly. (3) Where the applicant relates to a patent as to which a contractuitl licence or licence of right is registered, the written consent of the licensee shall be attached to the written declaration, othenvise, the application for surrender shall not be registered.