In late-1931, National Company was selected by the Department of Commerce (who was in charge of airports and airways through the Aeronautical Branch) to build new superheterodyne receivers to replace the old regenerative receivers then being used at airports around the country.Į-NPs are e-book versions of our world-leading paper-based Nautical Publications. National's chief engineer and general manager, James Millen, had guided the company from its early radio designs (that usually had National as a parts supplier) into the new shortwave receiver market that was becoming popular by 1930. RHM Airport Receiver By the early thirties, National had grown from a company that produced radio parts and regenerative TRF receivers into one of the top shortwave receiver producers in the country. Commercial & Military Communications Equipment Radio Boulevard Western Historic Radio Museum WHRM Radio Photo Gallery COMMERCIAL & MILITARY COMMUNICATIONS EQUIPMENT 1932 - 1942 & 1946 - 1969 (Airport, Shipboard, General Purpose & Military Gear) (For WWII gear go to 'WWII Communications Equipment' - Nav Link in Index Below) Photo: Army Troubleshooting Commercial & Military Communications Gear - 1932-1942 & 1946-1969 Pre-WWII Gear - 1932 - 1942 Airport Communication Receivers National Company, Inc.
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