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[quote user="taildisk"]Thanks to all who responded. "The Hazardous Materials Transportation Act (HMTA), enacted in 1975, is the principal federal law in the United States regulating" seems to say it all, ie a date for the current type to start. Rob [/quote] While the modern placards started in 1975, there were placards dating back to the early 1900s for all manner of things.  For example: during your stated modeling time period there where 3 different explosive warning labels.  See the handout pdf next to the clinic I linked.
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