Description
Original U.S. WWI M1917 Trench Knife by L.F. & C. dated 1917 with Scabbard Blunderbuss 509th Parachute Infantry Battalion 509th Parachute Infantry Battalion Pressure of 400 pounds (180 kg) on the center of the mine or 200 pounds (91 kg) on its edge deforms the pressure plate compressing a spring