Grado is famous for their remarkable headphone and phono cartridge designs and hold over 48 patents. Company founder, Joseph Grado is credited as the inventor of the stereo moving coil phono cartridge....
http://www.gradolabs.com
Grado is famous for their remarkable headphone and phono cartridge designs and hold over 48 patents. Company founder, Joseph Grado is credited as the inventor of the stereo moving coil phono cartridge....
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