# The Coal and Other Mines (Ventilation) Order 1956, Paragraph 10


(1) At every mine in any part of which the use of lamps or lights, other than permitted lights, is unlawful, there shall be provided appliances for detecting the presence of inflammable gas being appliances of a type approved by the Minister for use in mines generally or in mines of a class to which that mine belongs or in that mine (hereinafter called “detectors”) in such number as will enable the provisions of these regulations to be complied with.
(2) Those detectors shall be adjusted, maintained and tested in the manner (if any) specified in the relevant approval.

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Source: https://www.legislation.gov.uk/uksi/1956/1764/schedule/FIRST/paragraph/10 (the official version)
Page: https://openlegislation.uk/coal-and-other-mines-ventilation-order-1956/schedule-FIRST/paragraph-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.