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Alexander Graham Bell invents the telephone.
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The telephone was first modifided
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This telephone was nicknamed the "oil cans" because of its unique shape.
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Telephones in 1940 and 1950 were similar since both were more modern versions of te telephone.
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During this time there were wall phones, desk phones, and cordless phones.
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Celluar phones and flip phones were introducted.
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Now, phones are more modern and are easier to use and carry around.