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A resource for reliable information about significant people, places, events, and things in Minnesota history.
Minnesota Mining and Manufacturing Company (3M) announces the invention of a machine for the mass recording of magnetic audio tape.
Made possible by the Arts and Cultural Heritage Fund through the vote of Minnesotans on November 4, 2008. Administered by the Minnesota Historical Society.
Minnesota Historical Society • 345 W. Kellogg Blvd., St. Paul, MN 55102-1906 (Map) • 651-259-3000 © MNHS.
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