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Crystal Engineering Ltd. is a Bulgarian company centered in Sofia specialized in the design and construction of electrical power supply and communication networks and automation. Since its creation in 1995 it has participated in numerous residential, administrative, and industrial projects. The company also has an independent certified type "C" control organ, according to EN ISO/IEC 17020:2004, accredited for measurements of phase - earth loop impedance, earthing resistance, and insulation resistance.

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