Just from memory, I think Needham invented an ejector system that W.W. Greener fancied. Greener bought the patent and Needham's whole operation in 1881(?), and employed Needham to supervise the building of Needham badged guns there, until his death. The Needham name was in good repute, so Greener continued producing guns in his name for years afterward as he was entitled to do under the purchase agreement...Geo