Before 1954, so-called portable radio receivers used vacuum tubes to receive and amplify signals.
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Grade Range:
9-12
Resource Type(s):
Primary Sources, Lessons & Activities
Date Posted:
8/18/2008
Public confidence in the accuracy of voting systems is the focus of this section of the online exhibition entitled Vote: The Machinery of Democracy, from the Smithsonian’s National Museum of American History. Students will learn how the recount of ballots during the 2
