The Plastic Forming Company, Inc

In late 1963, Peter T. Schurman was working to develop a new blow molded step for a Hamilton Cosco kitchen stool. Designed to replace the steel and rubber steps then in use, the top surface of the new molded step was flat and textured, while the bottom surface was ribbed - providing greater rigidity, and making it easier to attach the step to the stool's metal frame. While inspecting two prototype parts one day, it dawned on Schurman that if he joined two of those steps together with some kind of hinge, he would create a rectangular box with interior compartments that could be used as a package - in other words, a double-wall blow molded case.