Certificates / test marks
DLG quality seal `Fels CalciDes´
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Management system certificate DIN EN ISO 9001
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Management system certificate DIN EN ISO 14001
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Management system certificate DIN EN ISO 9001_english
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Management system certificate DIN EN ISO 14001_english
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Energy management system certificate ISO 50001
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Certification maintenance centre
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Certificate Energy Efficiency Initiative – Networks
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