Vacuum tube

Period

1904

Map

Inventions map

A vacuum tube, vac tube, electron tube, thermionic valve, or tube is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. It takes the form of an evacuated tubular envelope of glass or sometimes metal containing electrodes connected to external connection pins.

Sources: Wikipedia — Vacuum tube · CC BY-SA 4.0

Earlier and later events nearby

1. 1848The Communist Manifesto
2. 1859On the Origin of Species
3. 1871Unification of Germany
4. 1904Vacuum tubeThis page
5. 1914First Battle of the Marne
6. 1914–1918World War I
7. 1916Battle of Verdun

Who ruled this land

States that held this place in the historical borders data (Cliopatria). Years are approximate, as fine as the data's snapshots (every few years to a century). Tap to open the map for that year.

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