A couple of years ago (2005) I had a post entitled Ken Burns and patents which discussed a Ken Burns documentary on Jack Johnson, the first African-American Heavyweight Champion of the World. Mr. Johnson was also an inventor, having three issued patents.
My (and my readers’) research turned up the patent numbers of two of the three patents … but that third one has never been found. Perhaps one of my 2007 readers can find it (or somehow confirm there are just two).
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