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It was patented in 1794
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The treaty was dated April 30 and it was signed on May 2. The US Senate ratified the purchase in October. France didn't transfer the authority until December of 1803.
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US Congress passed it on the 3rd, but President James Monroe signed it on the 6th.
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It was developed in the 1830s and 1840s
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Edison filed his first patent application for the improvement of electric lights on this day.
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