HB 509-1974
Column (600×900×1000) (English Version)
- Standard No.
- HB 509-1974
- Language
- Chinese, Available in English version
- Published By
- Professional Standard - Aviation
- Status
- 1989-12
- Replace By
- HB 509-1989
- Latest
- HB 509-1989
HB 509-1974 history
- 1989 HB 509-1989 Column (600×900×1000)
- 1970 HB 509-1974 Column (600×900×1000)
