JJG 91-1989
Verification Regulation of Base Circle Involute and Helix Gear Tester (English Version)
- Standard No.
- JJG 91-1989
- Language
- Chinese, Available in English version
- Release Date
- 1989
- Published By
- National Metrological Verification Regulations of the People's Republic of China
- Status
- 2004-12
- Replace By
- JJF 1122-2004
- JJF 1124-2004
- Latest
- JJF 1122-2004
- JJF 1124-2004
JJG 91-1989 history
- 2004 JJF 1122-2004 Calibration Specification for Gear Helix Measuring Instruments
- 1989 JJG 91-1989 Verification Regulation of Base Circle Involute and Helix Gear Tester
JJG 91-1989 Verification Regulation of Base Circle Involute and Helix Gear Tester was changed to JJF 1124-2004 Calibration Specification for Gear Involute Measuring Instruments.
JJG 91-1989 Verification Regulation of Base Circle Involute and Helix Gear Tester was changed to JJF 1122-2004 Calibration Specification for Gear Helix Measuring Instruments.
