MA: Representing Mei An
Supervisor and issuing unit: National Safety Mark for Mining Products;
locations of use: Underground coal mine
KA： Representing Kuang An
Supervisor and Issuing Unit: Office of Safety Signs for Mining Products
locations of use: Non coal mines.
In addition, KY is the general type used for mining, which is used in non gas areas of coal mines and some areas of low gas mines or non coal mines.
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