electromagnetic transducer

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A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Franklin D. Roosevelt, who formulated the Four Freedoms.

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Bar graph of the United States Death Toll during major events. Infogram chart.

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electromagnetic transducer

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In transducer
These operate on electromagnetic principles.
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