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Service of documents on the Board. 
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58.—Any document required by or authorised by law to be served on the Board may be so served by— 
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(a) handing it to the secretary of the Board at the principal office in the State of the Board, or 
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(b) leaving it at the principal office aforesaid in an envelope addressed to the secretary of the Board, or 
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(c) sending it by post in a prepaid registered letter addressed to the secretary of the Board at the principal office aforesaid. 
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