# The Coal Mines (Cardox and Hydrox) Regulations 1956, Regulation 13


A person appointed to fire shells who is in charge of any electric shot firing apparatus—
(a) shall retain the removable handle or key in his own possession throughout the period while he is on duty;
(b) shall not place the removable handle or key in position in the apparatus until he is about to fire a shell; and
(c) shall remove it from the apparatus immediately after firing each shell.

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Source: https://www.legislation.gov.uk/uksi/1956/1942/regulation/13 (the official version)
Page: https://openlegislation.uk/coal-mines-cardox-and-hydrox-regulations-1956/regulation-13
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.