Period

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Portrait of Edward Whitehouse
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Portrait of Edward Whitehouse

Portrait of Werner von Siemens
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Portrait of Werner von Siemens

Illustration of the 'Cooke and Wheatstone Telegraph' an early electrical telegraph system created by William Fothergill Cooke
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Illustration of the 'Cooke and Wheatstone Telegrap...

Portrait of Friedrich Siemens
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Portrait of Friedrich Siemens

Portrait of Charles Wheatstone
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Portrait of Charles Wheatstone

Portrait of Charles Wheatstone
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Portrait of Charles Wheatstone

Portrait of Charles Wheatstone
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Portrait of Charles Wheatstone

Portrait of Werner von Siemens
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Portrait of Werner von Siemens

thermionic tube or thermionic valve
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thermionic tube or thermionic valve

Walter Nash prime Minister of New Zealand 1942
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Walter Nash prime Minister of New Zealand 1942

thermionic tube or thermionic valve
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thermionic tube or thermionic valve

The Hot line between the President of the USA and the Premier of the USSR
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The Hot line between the President of the USA and ...

Magazine article from 1955 celebrating achievements in television
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Magazine article from 1955 celebrating achievement...

Magazine article from 1955 celebrating achievements in television
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Magazine article from 1955 celebrating achievement...

World War I : Communication
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World War I : Communication

Heroic wireless operators, 1912
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Heroic wireless operators, 1912

Telephone: man on left is making call
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Telephone: man on left is making call

Wall mounted telephone
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Wall mounted telephone

Carbon microphone, invented in 1878
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Carbon microphone, invented in 1878