In addition to the Fleet brand, Penens also produced tools for the "Challenger" brand, at least up until the early 1960s. A 1951 Challenger catalog lists the Penens Corporation in Schiller Park, Illinois as the company address, and shows the Challenger logo as a gladiator's helmet.
However, a later Challenger catalog from the early 1960s lists the company as the Challenger Division of Pendleton Tool Industries, with an address in Cleveland, Ohio. Pendleton Tool was the parent company of Plomb Tool, Penens, P&C, and other subsidiaries, but it's currently a bit of a mystery that Challenger ended up in Cleveland. One possibility is that Pendleton had shifted the production of Challenger tools to the Vlchek factory in Cleveland, after having acquired Vlchek Tool in 1959.