QJ 20-1981
(English Version)
- Standard No.
- QJ 20-1981
- Language
- Chinese, Available in English version
- Published By
- Professional Standard - Aerospace
- Status
- 1990-11
- Replace By
- QJ 1931.4-1990
- Latest
- QJ 1931.4A-2005
QJ 20-1981 history
- 2005 QJ 1931.4A-2005 The drawing rules of electrical diagrams--Part 4: Circuit diagram
- 1990 QJ 1931.4-1990 Electrical schematic drawing rules circuit diagram
- 1970 QJ 20-1981
QJ 20-1981 was changed to QJ 1931.4-1990 Electrical schematic drawing rules circuit diagram.
