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Harvey Fletcher autograph auction results
Harvey Fletcher · $40.25(1884-1981) American Physicist. He was the inventor of the hearing aid and the audiometer and is noted as the father of the stereophonic sound. This item is a typed signed letter,…Jan 27, 2008 · Auction #907 · Lot 298
(1884-1981) American Physicist. He was the inventor of the hearing aid and the audiometer and is noted as the father of the stereophonic sound. This item is a typed signed letter, dated 1972. It has the usual mailing folds.
Jan 27, 2008 · Auction #907 · Lot 298 · More by signer