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Unsigned pencil sketch on an off-white lightly lined 5 x 8 sheet. The bottom margin bears a handwritten annotation signed by [Jaffrey P.] Buchanan, manager of Edison’s record disc division: “Note this sketch made by Mr. Edison during talk on incompressibility of rubber, Buchanan, 1923.” Uniform toning and a few small edge tears, otherwise fine condition. RRAuction COA.
