IP/N/I/NGA/T/2 Page II (3) All applications on Form 33 under this regulation shall be signed by the applicant for registration or the registered proprietor or registered user, as the case may be, or by an agent expressly authorised by him for the purpose of such an application, unless in exceptional circumstances the Registrar otherwise allows. (4) In any case in which no address for service is entered in the register, the Registrar may treat the trade or business address of the registered proprietor or registered user as therein entered as his address for service for all purposes connected with the registration. (5) Any written communication addressed to a party or person as aforesaid at an address given by him, or treated by the Registrar, as his address for service shall be deemed to be properly addressed. (6) The Registrar, at any time that a doubt arises as to the continued availability of an address for service entered in the register, may request the person for whom it is entered by letter addressed to his trade or business address in the register, to confirm the address for service and if within three months of making such a request the Registrar receives no confirmation of that address, he may strike it off the register. Agents 16. (1) Except as otherwise required by these Regulations, any application, request or notice which is required or permitted by the Act or these Regulations to be made or given to the Registrar, and all other communications between an applicant or a person making such a request or giving such a notice and the Registrar and between the registered proprietor or a registered user of a trade mark and the Registrar or any other person, may be signed, made or given by or through an agent. (2) Any such applicant, person making request or giving notice, proprietor, or registered user may appoint an agent to act for him in any proceedings or matter before or. affecting the Registrar under the Act and these Regulations by signing and sending to the Registrar an authority to that effect in the Form I or in such other written form as the Registrar may deem sufficient. In case of such appointment, service upon the agent of any document relating to the proceeding or matter shall be deemed to be service upon the person so appointing him, all communications directed to be made to such person in respect of the proceeding or matter may be addressed to such agent, and all attendances upon the Registrar relating thereto may be made by or through such .agent. In any particular case the Registrar may require the personal signature or presence of an applicant, opponent, proprietor, registered user or other person. Agents.