BrianS
Contributor
I found these sites interesting while I was researching Tank Markings, just posting for info.
http://www.luxfercylinders.com/support/markings/
http://www.adp.fsu.edu/pennotesfall2003/Section07.pdf
http://www.luxfercylinders.com/support/markings/
http://www.adp.fsu.edu/pennotesfall2003/Section07.pdf