Certification
Certification and patent of Taechang
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Business registration
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Certificate of seal
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Certificate of all registered matters
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Factory registration certificate
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Construction business registration certificate (metal window)
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Construction business registration certificate (mechanical gas facilities)
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Construction business registration certificate (steel structure)
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Tax payment certificate
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Environmental Management System Certificate
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Certificate of Safety and Health Management System
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Quality Management System Certificate
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Recognition of R&D department
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Venture business confirmation
