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Photograph of Guglielmo Marconi's wireless telegraph station in Cornwall, which sent and received signals between England and America

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Photograph of Guglielmo Marconi's wireless telegra...

Photograph of a technician holding a laser 'demodulator' used to convert laser light beams into television signals and radio sounds

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Photograph of a technician holding a laser 'demodu...

A train guard blowing a whistle to indicate that the train is about to leave

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A train guard blowing a whistle to indicate that t...

A torpedo placer

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A torpedo placer

Photograph of a technician holding a laser 'demodulator' used to convert laser light beams into television signals and radio sounds

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Photograph of a technician holding a laser 'demodu...

A train guard about to close the carriage door as a flustered man rushes to reach the train before it leaves

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A train guard about to close the carriage door as ...

A signal gantry at Cannon Street, London

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A signal gantry at Cannon Street, London

A signalman moving the points at Tilbury Docks

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A signalman moving the points at Tilbury Docks

A combined Semaphore and Light Railway Signal

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A combined Semaphore and Light Railway Signal

A typical signal box

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A typical signal box

A typical signal box

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A typical signal box

A typical signal box

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A typical signal box

A signalman moving the points at Tilbury Docks

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A signalman moving the points at Tilbury Docks

A Semaphore Signal on an American railroad

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A Semaphore Signal on an American railroad

A man trying to stop a train during an emergency

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A man trying to stop a train during an emergency

A typical signal box

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A typical signal box

Inaugural meeting of the Estates General, 5th May 1789

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Inaugural meeting of the Estates General, 5th May ...

A train guard blowing a whistle to indicate that the train is about to leave

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A train guard blowing a whistle to indicate that t...

A sectional view of a French signal box

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A sectional view of a French signal box

A torpedo placer

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A torpedo placer

A train guard about to close the carriage door as a flustered man rushes to reach the train before it leaves

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A train guard about to close the carriage door as ...

Guglielmo Marconi's wireless telegraph station in Dresden, which received signals from Oberschöneweide and transmitted them to Karskrona in Sweden and Poldhu in Cornwall

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Guglielmo Marconi's wireless telegraph station in ...

A typical signal box

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A typical signal box

A Dwarf Semaphore Signal and Split Switch on an American Railroad

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A Dwarf Semaphore Signal and Split Switch on an Am...

The signal box at Waterloo on the Charing Cross line

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The signal box at Waterloo on the Charing Cross li...

The instrument panel for pneumatic signalling system, Pittsburgh Yards, Pennsylvania Railroad

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The instrument panel for pneumatic signalling syst...

A signalman waving his flag and blowing a whistle to get attention of an oncoming train

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A signalman waving his flag and blowing a whistle ...

Scenes at Pittsburgh during the railway workers strike

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Scenes at Pittsburgh during the railway workers st...

A Model of King's automatic block system of railway signalling

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A Model of King's automatic block system of railwa...

A signal gantry at London Bridge Station

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A signal gantry at London Bridge Station

Primrose Hill Tunnel, on the London and Birmingham Railway line

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Primrose Hill Tunnel, on the London and Birmingham...

Photograph showing the antenna for the new Raytheon Radar, a weather-sealed 30-inch plastic dome shown here installed over pilot house of the Fury II of Newport Beach, California

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Photograph showing the antenna for the new Raytheo...

A typical signal box

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A typical signal box

A Semaphore Signal on an American railroad

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A Semaphore Signal on an American railroad

The signal box at Clapham Junction

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The signal box at Clapham Junction

U.S. Army Signal Corps recruiting poster

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U.S. Army Signal Corps recruiting poster

Photograph of a tank being used during World War Two

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Photograph of a tank being used during World War T...

Photograph of Martin Rodbell

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Photograph of Martin Rodbell

Women doing war work. Assembling naval signal lamps; England during WWI 1916

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Women doing war work. Assembling naval signal lamp...

Aerial Telegraph

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Aerial Telegraph

Aerial Telegraph

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Aerial Telegraph

Aerial Telegraph: Naval Semaphore

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Aerial Telegraph: Naval Semaphore

The open air kitchen used by German prisoners while a new mess hall and kitchen is being erected at Camp Miramas

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The open air kitchen used by German prisoners whil...

Signal off the Delaware coast. Planted by the 'Ranger' 1929.

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Signal off the Delaware coast. Planted by the 'Ran...

Leap of Japan Illustrated cover, in June 1939

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Leap of Japan Illustrated cover, in June 1939

World War One US Army Recruitment poster by Michael P. Whelan

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World War One US Army Recruitment poster by Michae...

Allied bombers blow up a Nazi bridge near Florence

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Allied bombers blow up a Nazi bridge near Florence

Night signalling by torches across the James River by artist William Waud

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Night signalling by torches across the James River...

Thumbs Down! by artist Will Crawford

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Thumbs Down! by artist Will Crawford

Anti-aircraft bofors gun in Algeria, 1943

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Anti-aircraft bofors gun in Algeria, 1943

Signalman. The main picture shows the signalman at work in the signal box. Below, searchlights are

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Signalman. The main picture shows the signalman at...

World War II 1939-1945

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World War II 1939-1945

World War II 1939-1945

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World War II 1939-1945

World War II - Russian Front

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World War II - Russian Front

World War II 1939-1945

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World War II 1939-1945

World War II 1939-1945

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World War II 1939-1945

World War II - Russian Front

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World War II - Russian Front

World War II 1939-1945

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World War II 1939-1945

World War II - Russian Front

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World War II - Russian Front

World War II 1939-1945

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World War II 1939-1945

World War II

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World War II

World War II - Russian Front

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World War II - Russian Front

World War II 1939-1945

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World War II 1939-1945

World War II - Russian Front

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World War II - Russian Front

World War II - Russian Front

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World War II - Russian Front

World War II - Russian Front

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World War II - Russian Front

World War II - Russian Front

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World War II - Russian Front

World War II 1939-1945

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World War II 1939-1945

Hans Albers as Baron Munchausen riding on a canon ball

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Hans Albers as Baron Munchausen riding on a canon ...

World War II 1939-1945

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World War II 1939-1945

World War II 1939-1945

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World War II 1939-1945

British marines practicing sending and receiving signals by heliograph

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British marines practicing sending and receiving s...

World War II 1939-1945

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World War II 1939-1945

World War II

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World War II

World War II 1939-1945

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World War II 1939-1945

World War II 1939-1945

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World War II 1939-1945

World War II - Russian Front

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World War II - Russian Front

French farm workers during WWII

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French farm workers during WWII

World War II 1939-1945

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World War II 1939-1945

World War II 1939-1945

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World War II 1939-1945

World War II 1939-1945

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World War II 1939-1945

Perpendicular Canal Lift

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Perpendicular Canal Lift

Perpendicular Canal Lift

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Perpendicular Canal Lift

Fog signal being fired on the Eddystone lighthouse

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Fog signal being fired on the Eddystone lighthouse

The Rape of the Sabines

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The Rape of the Sabines

Héros du télégraphe

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Héros du télégraphe

Aerial Telegraph

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Aerial Telegraph

Aerial Telegraph

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Aerial Telegraph

Sending a semaphore signal using flags

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Sending a semaphore signal using flags

Aerial Telegraph

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Aerial Telegraph

Aerial Telegraph: Ancient Greek soldiers tending a signal fire

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Aerial Telegraph: Ancient Greek soldiers tending a...

Heliograph, a visual telegraph

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Heliograph, a visual telegraph

A Puritan Family

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A Puritan Family

Première Guerre Mondiale : Corps des transmissions de l'Armée Américaine en France,

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Première Guerre Mondiale : Corps des transmissions...