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HowStuffWorks "How UPC Bar Codes Work"
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electronics.howstuffworks.com/...upc.htm
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howstuffworks
barcode
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Sharanda Payseur
on 06 Dec 12
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HowStuffWorks "Battery History"
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electronics.howstuffworks.com/...battery1.htm
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battery
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Sharanda Payseur
on 04 Dec 12
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