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Roland GR-Series
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1970s Roland GR-500 Guitar Synth
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Roland GR-500 1977 Vintage Analog Guitar Synthesizer - Photos, Videos, Documentation
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1977 | Roland GR500: Overview – Rob OReilly | Expressiv MIDI Guitars
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Roland GR-500/GS-500 1978 | Reverb
1977 Roland GS-500 guitar synthesizer, made in Japan, ser. no. K7xxxx9
