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In reference to the patent: US465972

I've noticed that this Google Patents page lists the filing date of a patent as Apr 10, 1839, but that's before the inventor, Thomas Edison, was born. How could this be?

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Filing date mentioned in Google Patent is wrong, actual filing year is 1889 actual pdf file contains correct date.

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due to error in OCR software it is incorrectly mentioned as 1939.

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