W. Hundhausen Bauunternehmung GmbH - Siegen-Eisern — Siegen- Eisern, Germany
| Certificate Number | 1043-CSC21-2023 | Date of certification | May 22, 2023 |
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| Certificate Type | Concrete, Precast | Version | 2.1 Deutsch |
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| Certificate Number | 1043-CSC21-2023 | Date of certification | May 22, 2023 |
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| Certificate Type | Concrete, Precast | Version | 2.1 Deutsch |
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| Certificate Number | 469-CSC21-2023 | Date of certification | Apr 26, 2024 |
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| Certificate Type | Concrete, Ready mixed | Version | 2.1 Deutsch |
| Client website — Certificate — CO₂-Module | |||
| Certificate Number | 663-CSC21-2023 | Date of certification | Apr 26, 2024 |
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| Certificate Type | Concrete, Ready mixed | Version | 2.1 Deutsch |
| Client website — Certificate — CO₂-Module | |||
| Certificate Number | 664-CSC21-2023 | Date of certification | Apr 26, 2024 |
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| Certificate Type | Concrete, Ready mixed | Version | 2.1 Deutsch |
| Client website — Certificate — CO₂-Module | |||
| Certificate Number | 665-CSC21-2023 | Date of certification | Apr 26, 2024 |
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| Certificate Type | Concrete, Ready mixed | Version | 2.1 Deutsch |
| Client website — Certificate — CO₂-Module | |||
| Certificate Number | 1349-CSC21-2023 | Date of certification | Nov 19, 2024 |
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| Certificate Type | Aggregate | Version | 3.0 Deutsch |
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| Certificate Number | 1350-CSC21-2023 | Date of certification | Jun 30, 2024 |
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| Certificate Type | Aggregate | Version | 2.1 Deutsch |
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| Certificate Number | 256-CSC21-2021 | Date of certification | Nov 10, 2023 |
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| Certificate Type | Concrete, Ready mixed | Version | 2.1 Nederlands |
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| Certificate Number | 261-CSC24-2025 | Date of certification | Dec 22, 2025 |
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| Certificate Type | Aggregate | Version | 3.0 English |
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| Certificate Number | 1528-CSC24-2024 | Date of certification | Aug 23, 2024 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 Deutsch |
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| Certificate Number | 1523-CSC24-2024 | Date of certification | Aug 9, 2024 |
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| Certificate Type | Cement | Version | 3.0 Deutsch |
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| Certificate Number | 1527-CSC24-2024 | Date of certification | Aug 23, 2024 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 Deutsch |
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| Certificate Number | 1524-CSC24-2024 | Date of certification | Aug 8, 2024 |
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| Certificate Type | Aggregate | Version | 3.0 Deutsch |
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| Certificate Number | 1525-CSC24-2024 | Date of certification | Aug 23, 2024 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 Deutsch |
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| Certificate Number | 1526-CSC24-2024 | Date of certification | Aug 19, 2024 |
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| Certificate Type | Aggregate | Version | 3.0 Deutsch |
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| Certificate Number | 1522-CSC24-2024 | Date of certification | Aug 8, 2024 |
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| Certificate Type | Cement | Version | 3.0 Deutsch |
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| Certificate Number | 2091-CSC24-2026 | Date of certification | Apr 29, 2026 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 English |
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| Certificate Number | 2090-CSC24-2026 | Date of certification | Apr 29, 2026 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 English |
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| Certificate Number | 2094-CSC24-2026 | Date of certification | Apr 29, 2026 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 English |
| Client website — Certificate | |||
| Certificate Number | 2093-CSC24-2026 | Date of certification | Apr 29, 2026 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 English |
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| Certificate Number | 2096-CSC24-2026 | Date of certification | Apr 29, 2026 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 English |
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| Certificate Number | 2095-CSC24-2026 | Date of certification | Apr 29, 2026 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 English |
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| Certificate Number | 2092-CSC24-2026 | Date of certification | Apr 29, 2026 |
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| Certificate Type | Concrete, Ready mixed | Version | 3.0 English |
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| Certificate Number | 2055-CSC24-2026 | Date of certification | Apr 28, 2026 |
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| Certificate Type | Cement | Version | 3.0 English |
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| Certificate Number | 2056-CSC24-2026 | Date of certification | Apr 28, 2026 |
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| Certificate Type | Cement | Version | 3.0 English |
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