National Radio Company's R-1490/GRR-17 HF Receiver --- The last military receiver of National Radio Company --- |
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US Navy Radio Communications by K4NYW |
A Brief History of the National Radio Company by John J. Nagle, K4KJ |
Wikipedia entry for the National Radio Company |
The National Radio Company by OLDRADIOS.CO.NZ |
National AN/FRR-24 Triple Diversity HF Receiver |
National R1230/FLR Countermeasures HF Receiver |
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