Prolific inventor and entrepreneur (1860-1930) most famous as co-inventor, with Herman Anschütz-Kaempfe of the gyrocompass. Ink signature, “Elmer A. Sperry,” on an off-white 6 x 7 sheet of his personal letterhead. In fine condition, with a mild shade of overall toning, and light wrinkling to left of signature. RRAuction COA.
We use cookies on this site to improve your experience. By using this site, you accept our use of cookies. To learn more, please see our Privacy Policy.
