11.—(1) Any application, request or notice which is required or permitted under the Act or these Rules to be made or given to the Registrar, and all other communications between the applicant or a person making such a request or giving such a notice and the Registrar, and between the proprietor or the registered user of a trade mark and the Registrar or any other person, may be signed, made or given by or through an agent authorised by that person in writing.
(2) In any particular case, the Registrar may require the personal signature or presence of any person.
(3) The Registrar may, by notice in writing to an agent, require him to produce evidence of his authority.
(4) An agent authorised by any person mentioned in paragraph (1) shall lodge Form T.M. 1 to enter his address as the address for service, and service upon the agent at the address for service on record of any document shall be deemed to be service upon the person so authorising him, all communications directed to be made to such person may be addressed to the agent, and all attendances upon the Registrar relating thereto may be made by or through the agent.