HB 3311-1980
Adjust the zoom scale (English Version)
- Standard No.
- HB 3311-1980
- Language
- Chinese, Available in English version
- Release Date
- 1981
- Published By
- Professional Standard - Aviation
- Status
- 1991-07
- Replace By
- HB 3311-1991
- Latest
- HB 3311-1991
HB 3311-1980 history
- 1991 HB 3311-1991 Ruler for adjusting and changing distance
- 1981 HB 3311-1980 Adjust the zoom scale
