[OpenFontLibrary] Public Domain Fonts due to lack of copyright notice

[Fontfreedom at aol.com]

It's my understanding that anything published in the U.S. before March 1,  
1989 without a valid copyright notice is in the public domain. (unless the  work 
was registered with the copyright office, fees paid within a short  time 
period.)
 
It would seem likely SOME fonts were created during that time period  without 
a copyright notice. Does anyone know of any?
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