QJ 612-1981
(English Version)
- Standard No.
- QJ 612-1981
- Language
- Chinese, Available in English version
- Published By
- Professional Standard - Aerospace
- Status
- Latest
- QJ 612-1981
- Replace By
- QJ 612A-1998
QJ 612-1981 history
- 1970 QJ 612-1981
