- 2022-04-06key repair
- 2022-04-06key failure
- 2022-04-06Change the strings
- 2022-04-06Reed tuning
- 2022-04-06Set the hammer straight
- 2022-04-06Spring repair
- 2022-04-06Linkage adjustment
- 2022-04-06Spring frame waxing
- 2022-04-06手风琴维修
- 2022-04-06Adjust the microphone
