The original National HRO was a 9-tube HF (shortwave) general coverage communications receiver manufactured by the National Radio Company of Malden, Massachusetts, United States. == History == James Millen (amateur radio call sign W1HRX) in Massachusetts was in charge of the mechanical design.
The original National HRO was a 9-tube HF (shortwave) general coverage communications receiver manufactured by the National Radio Company of Malden, Massachusetts, United States. == History == James Millen (amateur radio call sign W1HRX) in Massachusetts was in charge of the mechanical design.
Source: Wikipedia "National HRO" · CC BY-SA 4.0
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