The digger that I assembled all the wood on it as close as they can figure was built in 1880. I will have to do some checking on patent papers because this was taken to the Bath Fair and it wouldn't seem that they would take it there without patent papers. Later on they, Saltsmans had a machine very similar to this one patented. I got the US Patent papers for the Keeler potato digger, he did not have a potato digger, it was patented here on October 6, 1885, it has a patent number on it, this within its self would absolutely do nothing. It appears that all he invented was an idea and according to the patent papers that they can't just patent an idea it has to be a working model and apparently that didn't work out this way. This potato digger that Keeler has you have to take a Saltsman digger take a lot of parts off, where the beater is mounted on the Saltsman digger you would have to mount a gear on it and match what he has patented to that in order to make it work because there were no wheels nothing on it and if you look at the patent papers he's got angle iron that goes around the circle, to have angle iron large enough to do this particular job.