US2000304 Патенты
THERMIONIC TUBE Filed April 25, 1931 INVENTOR, AAPEDAAP/CA. A. 7AAAAA/V. UNITED STATES PATENT OFFICE 2,000,304 THERMONIC TUBE Frederick E. Terman, Stanford University, Calif. Application April 25, 1931, Serial No. 532,742 6. Clains.
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