File:Chữ ký số Viettel.jpg
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![File:Chữ ký số Viettel.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Ch%E1%BB%AF_k%C3%BD_s%E1%BB%91_Viettel.jpg/800px-Ch%E1%BB%AF_k%C3%BD_s%E1%BB%91_Viettel.jpg?20230810084936)
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Original file (1,588 × 1,122 pixels, file size: 448 KB, MIME type: image/jpeg)