# The Coal Mines (Cardox and Hydrox) Regulations 1956, Regulation 17


(1) No person shall insert a shell into a hole for firing unless he has satisfied himself by taking all reasonable precautions that the hole is so placed as to be safe for the firing of a shell, and so drilled as to enable the shell to be inserted without using undue force.
(2) No person shall press any shell into a hole for firing if it cannot be inserted without the use of undue force.

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Source: https://www.legislation.gov.uk/uksi/1956/1942/regulation/17 (the official version)
Page: https://openlegislation.uk/coal-mines-cardox-and-hydrox-regulations-1956/regulation-17
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.