有没有数字电位器？

有数字电位器,到网页里找，很多，如：
http://down.cndzz.com/soft/63168.htm
http://info.ec.hc360.com/html/001/002/001/022/65119.htm

二十多年前国外就公开销售
The next generation keyboard, future keyboard!
challenge and subverting the global computer keyboard, keyboard music instruments in 25 years ago，
The pioneer of the Chinese people firstly entered this area. who sent it into the modern house of CEO of Microsoft?
To challenge AT&T of the United States by improving communication deficiencies
Improving communication deficiencies, Chinese people challenge AT&T of the United States.