L yb - 7442 four - trace double - track recording and playing magnetic heads has won grade two award for science and technology advancement of shenzhen city Rp - 7442四迹双道录放磁头获得深圳市科学技术进步二等奖
2.
Cinematography - 8 mm film - sound - specification for location and width of magnetic striping and gaps of recording and reproducing heads for magnetic sound record on 8 mm motion - picture film with picture 电影技术.第1部分: 8mm胶片.第4节:伴音.第3小节:带有画面的8mm胶片录音磁道位置和宽度以及磁录音和录放磁头间隙规范