ALS signed “Edison,” one page, lightly-lined, 5 x 7, no date. Memo to his lab supervisor S. A. Moore. In full: “When you find the shortest time steam can be left on in curing condensite in press—let me know. I believe by adding more 6/4 I can reduce it still further—” Suede matted and framed with a color portrait of Edison, and a small name plaque, to an overall size of 21.5 x 19.5. In fine condition, with uniform toning, and light bisecting folds. Pre-certified PSA/DNA and RRAuction COA.
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