and often healthy cashflow, it also meant that Woolworth's changing fortunes heavily affected them. In the late-1950s and early-1960s, as Woolworth's began to offer more inexpensive plastic toys, Chein was faced with the dilemma of competing with plastic toys that could not only be produced more cheaply, but could more easily incorporate electronics. In the mid-1960s, Hoffman retired. Soon thereafter, the United States Government began to regulate the toy industry, in particular, the dangers posed by the sharp edges of metal toys. Stamped metal toy manufacturers were required to comply with federal regulations. Consequently, most U.S. tin toy manufacturers abandoned the material in favor of more easily compliant plastic and soft materials. Chein's management did not believe that plastic toys were as durable as metal toys, and the cost of retooling their tin toys to meet federal regulations was cost-prohibitive, so they phased out their tin toy manufacturing and diversified into other markets. Chein acquired the Learning Aids Group and its lines of educational materials, as well as its Renwal Plastics division. Renwal produced the successful series of anatomical kits that included "The Visible Man", "Visible Woman", "Visible Head" and "Visible Dog" models, as well as scale model vehicle kits. One of the final original Chein toy products, and one of its most complicated, was the electromechanical "Piano Lodeon", a child-sized player piano. It utilized a combination of plastic and tin, and a mechanism that used spooled rolls of punched paper with well-known songs programmed onto them. A total of approximately 50 tunes were available. The piano's keyboard was actuated by a vacuum produced by an electric fan, with a rubber tube connecting each key with a corresponding hole in the front of the piano's housing. When a hole punched in the paper passed over one of these holes, it caused the correct key to strike tuned tines inside the case, producing the desired tune. The keyboard could also be played manually. The device was never financially successful for Chein due to its complexity, high price and the rise to dominance of purely electronic musical instruments. In the late-1960s, Chein entered into a licensing agreement to produce "Peanuts" characters, which continued through the early-1970s. In the mid-1970s, Chein sold its Renwal division and focused upon manufacturing lithographed sheet steel housewares such as kitchen canister sets and wastebaskets, under the brand Cheinco. They also produced licensed metal containers for food brands