51Թ

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rolled-steel joist

noun

  1. RSJ.a steel beam, esp one with a cross section in the form of a letter H or I

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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