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Opening Permit
Opening Permit -
Hebei Province pollutant discharge permit
Hebei Province pollutant discharge permit -
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Business license -
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Substance supplier permit -
PetroChina Quality Certification
PetroChina Quality Certification -
ISO9001 quality system certification
ISO9001 quality system certification -
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Environmental Management System Certificate -
Occupational Health and Safety Management System Certification
Occupational Health and Safety Management System Certification
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