DS, signed “Howard R. Hughes,” one page, 8.5 x 11, April 16, 1951. A document certifying on behalf of the Hughes Tool Company that “no event which with the giving of notice or the lapse of time or both would constitute an event of default under the Collateral Promissory Note dated April 2, 1951, made by Howard R. Hughes to the order of Mellon National Bank and Trust Company, has occurred and is continuing at the date hereof.” Countersigned by Noah Dietrich, Executive Vice President of Hughes Tool Company and the billionaire’s longtime trusted confidant. The “Collateral Promissory Note” in question was evidently related to Hughes’ acquisition of a controlling interest in RKO Studios in 1948. A few faint bends and usual file holes, otherwise very fine, clean condition. LOA John Reznikoff/PSA/DNA and R&R COA.