3. Amendment of section 21. - In section 21 of the principal Act, for sub-section (1), the following sub-section shall be substituted, namely:--

"(1) Any person may, within four months from the date of the advertisement or re-advertisement of an application for registration, give notice in writing in the prescribed manner and on payment of such fee as may be prescribed, to the Registrar, of opposition to the registration.".

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