According to my grandather, Rolland Colison, his father Rudy Collison invented the Collison wrench. Rudy owned and operated a flour mill in Bruning, Nebraska. I believe he ran a mill in Ord, Nebraska before this. The patent is under Roland's name. Also, he stated that William Petersen had been friends with Rudy and then went on to invent and patent the vice-grip. I can find more information if you are interested.