91A. Exemptions to be cither prospective or retrospective.- Any notification granting exemption under section 87, section 88, section 90 or section 91 may be issued so as to take effect *[prospectively] on such date as may be specified therein. *[Substituted by the Employees' State Insurance (Amendment) Act, 2010 w.e.f. 01.06.2010 for the following : -"either prospectively or retrospectively"]
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