Hugo Borchardt worked for the Sharps Co. just before they went belly up, they scrapped plans for producing the 1875sharps and instead produced the '78 which was designed by Borchardt, it wasn't real popular at first, most didn't like the fact that it didn't have an external hammer. Sharps went under anyways, and Borchardt went to Europe and developed the semi on this thread but, you can see his influence in alot of designs both here and Eu.....the Win. toggle bolts on the '73,'76, the toggle on the Luger, etc.