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