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Copyright © 2023 introduction] tianan cloud construction engineering co., ltd., class b fire design, class b fire construction qualification [project]: fire design stamp; fire protection branch; fire protection company franchise; fire protection design [tel] 18931102119, 18931102119 "tianan cloud" All Rights Reserved iot data collectionintroduction] tianan cloud construction engineering co., ltd., class b fire design, class b fire construction qualification [project]: fire design stamp; fire protection branch; fire protection company franchise; fire protection design [tel] 18931102119, 18931102119 "tianan cloud"