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pamphlet of 12 pages by Sir William Petty (1623-1687) in which he claims to be the inventor of an instrument for double writing<br></div>
<bdi><a href="https://en.wikipedia.org/wiki/en:William_Petty" class="extiw" title="w:en:William Petty"><span title="English scientist, philosopher, statistician and economist (1623-1687)">William Petty</span></a>
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