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https://www.thehenryford.org/collections/explore/artifact/6051 Arc Transmitter Key, Used in the Hammond Radio Research Laboratory, 1916-1922 John Hays Hammond, Jr., was largely responsible for launching the field of radio control. In 1926, he built a medieval-inspired castle in Gloucester,... radio research laboratory in the https://www.thehenryford.org/collections/explore/artifact/189972 Fixed Condenser, Used in the Hammond Radio Research Laboratory, circa 1911 John Hays Hammond, Jr., was largely responsible for launching the field of radio control. In 1926, he built a medieval-inspired castle in Gloucester,... radio research laboratory in the fixed condenser used https://www.nict.go.jp/en/data/journal/rrl.html Library/Data | Journal of the Radio Research Laboratory | NICT-National Institute of Information... radio research laboratory library data of the