431. Powers of tribunal
For the purpose of dealing with any matter referred to it, the Tribunal shall adhere to the principles of natural justice and may, without being bound by the rules of evidence in civil or criminal proceedings—
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(a) request any person to furnish in writing or otherwise such particulars in relation to the matter;
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(b) where necessary summon and enforce the attendance of any person before the Tribunal to give evidence on oath or otherwise;
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(c) request the production of documents by a person so as to elicit all such information as in the circumstances may be necessary;
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(d) administer oaths and affirmations;
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(e) enter any premises of an employer where work is being or has been done by employees and inspect and view any work, material, machinery, appliances or articles therein and seek information from any person with respect to any matter that is before the Tribunal;
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(f) adjourn or postpone the hearing from time to time;
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(g) abridge or enlarge the time for instituting any proceeding or for doing any act, filing any document or presenting any evidence in connection with the proceeding;
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(h) amend or permit the amendment of any document filed in connection with the proceeding;
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(i) decide any question that may arise in the proceeding, including, without restricting the generality of the foregoing, any question as to whether—
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(i) a person is an employer or employee,
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(ii) a group of employees is an appropriate bargaining unit.