Illustration depicting a Semaphore Signal on an American railroad. One arm governs several tracks, the number of the track which is clearly shown on the indicator disk. The safety position was with the blade at 60 degrees in the lower quadrant. Dated 19th century.
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Details
Creative#:
TOP20952055
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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