# The Coal Mines (Precautions against Inflammable Dust) (Second Amendment) Regulations 1974, Paragraph 3


In regulation 6(a), for the words “60-mesh sieve of”, there shall be substituted the words “a sieve of which the nominal aperture size is 250 micrometres and which complies with”, and for the words “240-mesh sieve of”, there shall be substituted the words “a sieve of which the nominal aperture size is 63 micrometres and which complies with”.

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Source: https://www.legislation.gov.uk/uksi/1974/2124/schedule/paragraph/3 (the official version)
Page: https://openlegislation.uk/coal-mines-precautions-against-inflammable-dust-second-amendment-regulations-1974/schedule/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.