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South African 2003 Department of Mineral Ressource and Energy's (DMR) directive when cutting through burnt coal
The South African 2020 Mine Health And Safety Counsil's (MHSC) guideline for the "Prevention of Flammable Gas and Coal Dust Explosions in Collieries"
The Australian (Queensland) Recognized Standard 21
Explospot Systems would like to notify the reader, that this article's reference to "speed of light" should read "speed of sound".