Prior to the invention of steel props, timber props were used in construction. It was only at the beginning of the 20th century that William de Vigier invented the first ever adjustable prop after he moved from Switzerland to London in 1935. He actually named his invention after his solicitor Mr. A. Crow. Unlike the…
http://mindbogglingtrivia.wordpress.com/2014/09/18/the-invention-of-support-props/
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