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Professional Standard Category: Professional Standard - Energy |
Category No.: | NB | Valid Status: | superseded |
Issued Organization: | China Energy Administration | Issued Date: | 2011-07-01 |
Implemented Date: | Abolished Date: | ||
Superseded Standard.: | NB/T 47019.1~47019.8-2021 Purchase technical specification for boiler & heat exchanger tubes |
Superseded Date: | 2021-7-1 |
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