Haitovi–Sie OOD
| Certified locations: | 1 Rodopski izvor str., Sofia, 1680, Bulgaria |
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| Scope of activities: | " Design, construction and repair of buildings; design, construction and repair of optical telecommunication networks and routes, construction of local telephone networks; installation, maintenance and repair of telephone cable networks." |
| According to standard: | ISO 45001:2018 |
| Validity: | valid |