Last modified on 23 March 2012, at 17:29

Category:Mechanical semaphores

English: Mechanical devices for communicating messages by a physical movement. Some use the same moving flags as manual semaphore, others use an alternative arrangement, often a shutter showing either black or white. For the railway signals with a moving arm, see Semaphore signals

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Media in category "Mechanical semaphores"

The following 8 files are in this category, out of 8 total.