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    • What Is a Metronome and How Does It Work?

      HowStuffWorks via Yahoo News· 1 day ago

      "The Reparatory of Patent Inventions…" The University of Michigan. 1818. (March 9. 2011)http://books.google.com/books?id=dO80AAAAMAAJ&pg=PA7&source=gbs_toc_r&cad=4#v=onepage ...