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  • 21 Aug, 2019

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File:Benjamin Holt 1894.jpg
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current08:32, 25 February 2010Thumbnail for version as of 08:32, 25 February 2010250 × 439 (96 KB)Btphelps{{Information |Description={{en|1=Benjamin Holt, first to patent a workable tractor-type crawling tread design, at age 45 in 1894.}} |Source=http://www.hardhat.com/ME2/Audiences/dirmod.asp?sid=&nm=&type=Publishing&mod=Publications%3A%3AArticle&mid=8F3A702

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