![](https://nthumb.tpgimages.com/mid2_com_img/16166/26278/TOP25302447.jpg)
An engraving depicting the method of signalling using flags using a dot and dash system: AB, BA represents a dot: AC, CA serves as a dash. Dated 19th century
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Details
Creative#:
TOP25302447
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
No
Property Release:
No
Right to Privacy:
No
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