# The Coal Mines (Cardox and Hydrox) Regulations 1956, Regulation 24


(1) No person who has been posted as a sentry by a person about to fire a shell shall leave the place where he was posted unless personally directed so to do by that person.
(2) No person shall pass a danger sign exhibited for the purposes of these regulations without the authority of the person firing the shell or shall pass a sentry who has forbidden him to do so.

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Source: https://www.legislation.gov.uk/uksi/1956/1942/regulation/24 (the official version)
Page: https://openlegislation.uk/coal-mines-cardox-and-hydrox-regulations-1956/regulation-24
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.