A device described as the ‘mother of all Swiss Army knives’ has gone on display, which features more than 100 tools – including a gun. The incredible multi-tool boasts everything from a piano tuner to a .22-caliber revolver. Owned by the Smithsonian Institution and on display at the Buffalo Bill Centre of the West in Wyoming, USA, the ‘handy pocket knife’ is just the tool for the typical 19th century gentleman.