20 TRADE MARKS REGULATIONS, 1970 (L.I. 667) paragraph (b) of section 28 (10) of the Act shall be made on the prescribed form, and shall be accompanied by a statement of the grounds on which it is made. (3) An application by any person for the cancellation of the registration of a registered user under paragraph (c) of section 28 (10) of the Act shall be made on the prescribed form, and shall be accompanied by a statement of the grounds on which it is made. (4) The Registrar shall notify in writing applications under this regulation to the registered proprietor and each registered user (not being the applicant) whose registration is the subject of any such application and shall give notice thereof by advertisement in the Gazette. Any person who intends to intervene in the proceedings shall within two months of the publication of such advertisement give notice to the Registrar on the prescribed form to that effect and shall send therewith a statement of the grounds of his intervention. (5) The Registrar shall thereupon send copies of such notice and statement to the other parties, so that the intervention may be known to the applicant, the registered proprietor, the registered user whose registration is in -suit, and any other registered user who intervenes. Any such party may, within such time or times as the Registrar may appoint, leave evidence in support of his case and the Registrar, after giving the parties an opportunity of being heard, may accept or refuse the application or accept it subject to any conditions, amendments, modifications or limitations he may think right to impose. Regulation 52—Registered User's Application to Correct Register. Applications under section 34 (2) of the Act shall be made in writing y a registered user of a trade mark, or by such person as may satisfy the Registrar that he is entitled to act in the name of a registered user; and the Registrar may require such evidence by statutory declaration or otherwise as he may think fit as to the circumstances in which the application is made. Regulation 53—Extension of Time. If in any particular case the Registrar is satisfied that the circumstances are such as to justify an extension of the time for doing any act or taking any proceeding under these Regulations, not being a time expressly provided in the Act or prescribed by regulation 36 or 40, he may extend the time upon such notice to other parties, and proceedings thereon, and upon such terms as he may direct, and the extension may be granted though the time has expired for doing the act or taking the proceedings. Regulation 54—Excluded Days. Whenever the last day fixed by the Act, or by these Regulations, for doing any act or thing at the office of the Registrar falls on a day when the office is not open which day shall be an excluded day for the Purposes of the Act and these Regulations, it