Thanks Dwayne for the info. I've sent several emails to libraries, historical groups, and others in the area-few responses and really no info. Have searched patents by name, date, and product- can't find anything else Mr. Blankenship patented. I'm now working on the name, 1940 is really not that long ago so maybe can hit a link. Mrs. B and I will be in the Chattanooga area in couple weeks so maybe have time for a little footwork in the area. Mike