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The R-1511/GR Receiver was designed in 1968 by Hammarlund for the NSA, and is based on the SP-600. It saw government use until the mid 1980s.
The R-1511/GR Receiver was designed in 1968 by Hammarlund for the NSA, and is based on the SP-600. It saw government use until the mid 1980s.
