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Most mechanical calculators were comparable in size to small desktop computers and have been rendered obsolete by the advent of the electronic calculator.
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The electrical telegraph, or more commonly just telegraph, superseded optical semaphore telegraph systems, such as Claude Chappe's cables designed for communication among the French military
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they invented the bicycle to give people an alternative method of transportation besides horses.
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staplers are used to join multiple sheets of paper. Paper staplers come in two distinct types: manual and electric.
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