|Categories||Accident prevention , Disasters & accidents , Gas and dust control , Mine safety , Mine ventilation , Health and safety , Health , Medical conditions , Pneumoconiosis (Black Lung) , Medical treatment , Occupational health , Mining|
"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
|19:21:51, 11 January 2017 +|
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