My mom works out at Fort Buford, an historical site here in North Dakota. They have a 5 bladed knife that was believed to butcher buffalo. She said it looks kind of like a pastry blender. The blades are about 3 feet long, and the handle about 1 foot long. She said when the soldiers would go out and kill a buffalo, they would clean it and bring it back. Then about 4 soldiers would put this knife on the buffalo and rock it back and forth to cut it in half.