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This paper claims that Robert N. Noyce, co-founder of Intel Corp., was the inventor of the tunnel diode even as Leo Esaki received the 1973 Nobel Prize in physics for the achievement. When Esaki, then a 49-year old semiconductor research scientist at IBM Corp., won his Nobel Prize, neither he nor the Nobel committee had any idea about Noyce's work. Esaki had made a tunnel diode and measured its current versus voltage behavior 16 years earlier. The Nobel committee, in fact, dated Esaki's discovery from 1957, roughly contemporaneous with Noyce's recollected work in the same field. Noyce offers a notebook from 1956 which contains a complete description of the tunnel diode as proof.