During WWI, the U.S. Army Signal Corps rotated the inner ring of this cipher disk to encrypt messages in the field quickly.

px px dpi = cm x cm = MB
Details

Creative#:

TOP09068945

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

Same folder images:

Same folder images