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Citations

Credit Cards "Who Invented Credit Cards?" About.com Inventors. N.p., n.d. Web. 03 Apr. 2013.

VHS Sexton, Timothy. "How Do VHS Tapes Work?" EHow. Demand Media, 02 Apr. 2009. Web. 04 Apr. 2013."VHS." Wikipedia. Wikimedia Foundation, 04 Feb. 2013. Web. 04 Apr. 2013.

Speakers " How Do Speakers Work?| Explore | Physics.org. N.p., n.d. Web. 04 Apr. 2013. "Behringer Digital Monitor Speakers MS40." Hardware.Info. N.p., n.d. Web. 04 Apr. 2013.

Compass "How Compasses Work." HowStuffWorks. N.p., n.d. Web. 04 Apr. 2013. "More than Just Knowing Stuff!" » Different Compass Point! Same Ultimate Direction! N.p., n.d. Web. 04 Apr. 2013. Answers.com. Answers, n.d. Web. 04 Apr. 2013.

AC Generator "Stock Photo - Yellow-black Electric AC Generator Isolated on White Background." 123RF Stock Photos. N.p., n.d. Web. 05 Apr. 2013. "AC Motor." S and Generators. N.p., n.d. Web. 05 Apr. 2013.

Gravity Board "Miya Ando/Art." Ragazinecc RSS. N.p., n.d. Web. 05 Apr. 2013.