Given that this pump was seemingly invented 240 years ago, and then re-invented several times within the last 10 years give lie to the idea of "intellectual pro

Given that this pump was seemingly invented 240 years ago, and then re-invented several times within the last 10 years give lie to the idea of "intellectual property"? Who owns the "intellecutal property" of this pump? The estate of H.A. Wirtz, the Windfarm Museum, Peter Morgan of the Blair Research Laboratory, or David Hilton of Australia? Nicely documented case of multiple independent inventions of the same type of pump.