资质认证
- ISO/IEC 646:1991
- Information technology -- ISO 7-bit coded character set for information interchange
- 1991-12-15
- ISO/IEC 4873:1991
- Information technology -- ISO 8-bit code for information interchange -- Structure and rules for implementation
- 1991-12-15
- ISO 9931:1991
- Coal — Sampling of pulverized coal conveyed by gases in direct fired coal systems
- 1991-12-15
- ISO 9009:1991
- Glass containers — Height and non-parallelism of finish with reference to container base — Test methods
- 1991-12-15
- ISO/IEC 646:1991
- Information technology — ISO 7-bit coded character set for information interchange
- 1991-12-15
- ISO/IEC 4873:1991
- Information technology — ISO 8-bit code for information interchange — Structure and rules for implementation
- 1991-12-15
- ISO 7296-1:1991
- Cranes — Graphic symbols — Part 1: General
- 1991-12-15
- IEC 60821:1991
- VMEbus — Microprocessor system bus for 1 byte to 4 byte data
- 1991-12-14
- IEC 60127-3:1988/AMD1:1991
- Amendment 1 - Miniature fuses - Part 3: Sub-miniature fuse-links
- 1991-12-12
- ISO 9910:1991
- Oil of sweet orange — Determination of the total carotenoids content
- 1991-12-11
- ISO 7201-2:1991
- Fire extinguishing media — Halogenated hydrocarbons — Part 2: Code of practice for safe handling and transfer procedures of halon 1211 and halon 1301
- 1991-12-11
- ISO 4388:1991
- Cigarettes — Determination of the smoke condensate retention index of a filter — Direct spectrometric method
- 1991-12-11
- ISO 4532:1991
- Vitreous and porcelain enamels — Determination of the resistance of enamelled articles to impact — Pistol test
- 1991-12-11
- ISO 6934-3:1991
- Steel for the prestressing of concrete — Part 3: Quenched and tempered wire
- 1991-12-11
- ISO 9008:1991
- Glass bottles — Verticality — Test method
- 1991-12-11
- ISO 9057:1991
- Glass containers — 28 mm tamper-evident finish for pressurized liquids — Dimensions
- 1991-12-11
- ISO 9455-8:1991
- Soft soldering fluxes — Test methods — Part 8: Determination of zinc content
- 1991-12-11
- ISO 22:1991
- Belt drives — Flat transmission belts and corresponding pulleys — Dimensions and tolerances
- 1991-12-11
- ISO 9245:1991
- Earth-moving machinery — Machine productivity — Vocabulary, symbols and units
- 1991-12-11
- ISO 8035:1991
- Commercial road vehicles and buses over 3,5 t — Front towing attachments
- 1991-12-11
