# The Coal Mines (Cardox and Hydrox) Regulations 1956, Regulation 12


No person shall fire a shell in a mine except by means of electric shot firing apparatus and cable, both being provided by the owner of the mine and being of specifications approved by the Minister—
(a) if the shells are to be fired in a round, for multi-shot firing;
(b) in any other case, for single-shot firing.

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Source: https://www.legislation.gov.uk/uksi/1956/1942/regulation/12 (the official version)
Page: https://openlegislation.uk/coal-mines-cardox-and-hydrox-regulations-1956/regulation-12
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.