The story
The reinforcing bar was invented by A. L. Johnson of the St. Louis Expanded Metal Company.
Etymology from Wiktionary, CC BY-SA 4.0.
Johnson bar
Today it means: A corrugated metal bar used to reinforce concrete. Full definition →
Today it means: A corrugated metal bar used to reinforce concrete. Full definition →
The reinforcing bar was invented by A. L. Johnson of the St. Louis Expanded Metal Company.
Etymology from Wiktionary, CC BY-SA 4.0.