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This illustration dates to the 1870s and shows the signal box on the North London Railway. The
UMG25A05_349

This illustration dates to the 1870s and shows the...

December 1942
UMG22A19_164

December 1942

Mobile Video Camera In Korea
UMG21A18_463

Mobile Video Camera In Korea

Army Signal Service.
UMG20B15_262

Army Signal Service.

The frequency of the radio signals from sputnik 1 being measured at a radio control post near moscow observatory, 1957.
UMG20A99_164

The frequency of the radio signals from sputnik 1 ...

Railroad Train Signals
UMG20A17_447

Railroad Train Signals