History

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What is the history of the radio?

History

Speaker/Output Types:

1920's and earlier: Earphones only.

Until 1927: Battery-operated loudspeakers.

1920's-1930's: Loudspeakers.

1947: Transistor was invented.

   

Comments

3/28/2007 11:24:17 PM
sarah said:

i think that you should put more information about each of those topics




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