弦列宽频设计
String column broadband design
钢板定位设计
Steel plate positioning design
优化音缘设计
Optimize the sound edge design
不等厚音板设计
Unequal thickness board design
背柱增压设计
Back column pressurized design
环境适应设计
Environmentally adaptive design
击弦机
Stringing machine
弦槌
Hammer
键盘
keyboard
弦轴板
Peg plate
共鸣板
Sound board
铸铁板
Cast iron plate
琴弦&踏脚板
String & step board