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(3) Notwithstanding subsection (2), if it is shown to the satisfaction of the Minister, as respects any particular requirement of this Act, that by reason of substantial expenditure involved through the necessity of providing new, or altering existing, buildings, or on account of other special difficulties, it would be right in the case either of offices generally or of any class or description of office that the requirement should not come into operation on the day appointed under subsection (2), he may by order postpone the date of coming into operation of the said requirement as respects offices generally or that class or description of office, until such date as he may think fit but not later than two years after the day appointed under subsection (2).
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