73. (1) When a Sub-Registrar has refused to register a document on the ground that any person by whom it purports to be executed, or his representative or assign, denies its execution, any person claiming under such document, or his representative, assign or agent authorized as aforesaid, may, within thirty days after the making of the order of refusal, apply to the Registrar to whom such Sub-Registrar is subordinate in order to establish his right to have the document registered.(2) Such application shall be in writing and shall be accompanied by a copy of the reasons recorded under section 71, and the statements in the application shall be verified by the applicant in manner required by law for the verification of plaints.