- machineheads (tuning keys)
Akkord Musical Company, Ltd, were established in South Korea in 1970 and make guitar parts: machine heads, graphic equalisers and bridges and other guitar parts. I believe they are part of (or associated with) the Sungbo Industrial Company.
Akkord Musical Products Company Limited
316-317 Sungsu 2ga 3-Dong Sungdong GuSeoul