18.—(1) An application for the registration of a trade mark in Part A or B of the register shall be made on Form T.M. 4 and shall be signed by the applicant in accordance with rule 7 or by his agent.
(2) Each application shall be for registration in respect of goods or services in only one class set out in the Third Schedule.
(3) In the case of an application for registration in respect of all the goods or services included in a class, or of a large variety of goods or services, the Registrar may refuse to accept the application unless he is satisfied that the specification is justified by the use of the mark which the applicant has made, or intends to make if and when it is registered.
(4) Where, by reason of an application to register a trade mark made or deemed to have been made in a foreign state as defined in section 75(6) of the Act, a claim for priority under that section is made in an application for registration of the mark filed with the Registrar, the application shall state the name of the country in question and the date of the application made or deemed to have been made there, and the applicant shall file a certificate (with translations if necessary) by the registrar or other registering authority of that country or shall otherwise to the satisfaction of the Registrar verify the application made or deemed to have been made there.