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A corporation (other than a principal-business corporation the principal business of which is described in paragraph (a) or (b) of the definition principal-business corporation in subsection 66(15)), whose principal business is the production or marketing of sodium chloride or potash or whose business includes manufacturing products the manufacturing of which involves processing sodium chloride or potash, may deduct, in computing its income for a taxation year, the drilling and exploration expenses incurred by it in the year and before May 7, 1974 on or in respect of exploring or drilling for halite or sylvite.