HB 1251-1987
Square bearing of transition and one vertical slot (English Version)
- Standard No.
- HB 1251-1987
- Language
- Chinese, Available in English version
- Published By
- Professional Standard - Aviation
- Latest
- HB 1251-1987
- Replace
- HB 1251-75
HB 1251-1987 history
- 1970 HB 1251-1987 Square bearing of transition and one vertical slot
