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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.
The RHM was National's first superhet and it had some of the features that were to become National's trade-mark. input1= jobsite_storage_equipment/view_products.php? cat_id= php/fid27BF3BCB1A648805B511298CE6D643E72B4D59AD.aspx? The AGS was upgraded with newer tube types and other changes during its short production life (probably two or three production runs totaling no more than 300 receivers.) The major change was with the introduction of the AGS-X that added a front panel BFO control and a James Lamb type crystal filter to the receiver.In 1934, optional 10 meter coils were added as the AGS frequency coverage was increased to reflect the needs of a "ham receiver" - although at 5, not many hams could afford it.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.