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industry and administration - Long term signature - Part 4: Attributes pointing to proof of existence objects used in long term signature formats (Chinese: 行政、商业和行业中的数据元、过程和文档 长效签名 第4部分：用于长效签名格式的存证对象属性)
English versions: GB/T 29549
English versions: GB/T 14157-2023
English versions: GB/T 16895
English versions: GB/T 44797-2025
GB/T 7256.4-2023 Chinese PDF (GB/T7256.4-2023) GB 6944-2025 industry and administration - LongGB T 7256. 4 2023_Chinese: Lighting fixtures for civil airport Part 4: Wind direction indicator (Chinese: 4:) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 7256. 4 2023
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