(plural Johnson bars)
The reinforcing bar was invented by A. L. Johnson of the St. Louis Expanded Metal Company.
"johnson-bar." YourDictionary, n.d. Web. 16 January 2019. <https://www.yourdictionary.com/johnson-bar>.
johnson-bar. (n.d.). Retrieved January 16th, 2019, from https://www.yourdictionary.com/johnson-bar
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