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Amendment of section 1 of Act of 1919. 
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4.—The arbitration referred to in subsection (1) of section 1 of the Act of 1919 shall, in relation to the reference and determination under that subsection of any question, be the arbitration of a property arbitrator nominated for the purposes of such reference and determination by the Reference Committee in accordance with rules made by the Reference Committee under this section and, accordingly— 
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