| http://www.w3.org/ns/prov#value | - (a)a mine in the case of which, immediately before that date, the use below ground therein of lamps or lights, other than locked safety-lamps or some other means of lighting the use of which below ground therein was authorised by or under the enactments repealed by this Act, was unlawful or would have been unlawful but for an exemption then in force; or
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