What really constitutes an "original" with something like this? The original patent art would've been drawings on legal size paper, filed with the patent documentation. There wouldn't likely be multiple copies of it. I think its safe to assume, considering the subject here, that these are simply prints of what someone considered patent art - especially since they're poster sized. If you look at the other posters that this seller offers, a lot of them look like they could be reprints of the original filed patent art, but others appear to simply be of a similar style. Of course, any patent art old enough becomes public domain and can be reprinted; patents by definition have a shelf life. Most of the posters show items that are sufficiently old enough to qualify...