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18.1 Inventors of the age

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5 / 7  Which of these was not a successful invention of the era?
A  high-powered sewing machines
B  movies with sound
C  frozen foods
D  typewriters
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Practice MCQ 2 FlashCards 1

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Source:  OpenStax, U.s. history. OpenStax CNX. Jan 12, 2015 Download for free at http://legacy.cnx.org/content/col11740/1.3
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