Here's one of the lists in question: CLICK

The problem appears to be that it's mainly a list of patents, which are usually enhancements to or variations upon pre-existing inventions, not the literal inventions themselves. Mr. Flemming apparently patented a variation upon the guitar, but the only description given on the list is "guitar". Apparently, Mr. Flemming invented a guitar (apparently one that was sufficiently different from pre-existing guitars to merit a patent), but some moron got hold of the list and misinterpreted it to mean Mr. Flemming invented the guitar.

According to the list, a W.A. Deitz received a patent for a shoe on April 30, 1867. I don't think anyone would interpret that to mean Mr. Deitz invented the shoe, only that he received a patent for something shoe related. Everyone knows that shoes were around long before 1867. That someone would think Mr Flemming invented the guitar just indicates that he or she doesn't know squat about guitars and doesn't know how to do a bit of simple research.