User:Acroterion/Toncan iron

Toncan iron

https://archive.org/details/ThePathToSheetMetalPermanenceToncanIron_853/page/n71

https://archive.org/details/AFewFactsAboutToncanIronForArchitectsAndEngineers

https://www.washingtonpost.com/transportation/2019/09/12/iron-workers-fixing-washingtons-historic-memorial-bridge-manhandle-steel-girders-mind-their-fingers/

http://archive.lib.msu.edu/tic/golfd/page/1931feb21-30.pdf

http://www.nydiners.com/wdmain2.html

https://vintagefiretruck.com/2017/09/page/7/