Editing Timeline of historic inventions (section)

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The '''timeline of historic inventions''' is a chronological list of particularly significant technological [[invention]]s and their [[inventor]]s, where known.{{efn|Dates for inventions are often controversial. Sometimes inventions are invented by several inventors around the same time, or may be invented in an impractical form many years before another inventor improves the invention into a more practical form. Where there is ambiguity, the date of the first known working version of the invention is used here.}}  This page lists nonincremental inventions that are widely recognized by reliable sources as having had a direct impact on the course of history that was profound, global, and enduring. The dates in this article make frequent use of the [[Year#Abbreviations for "years ago"|units mya and kya]], which refer to millions and thousands of years ago, respectively.
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