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Standards GB - Chinese national standards - Page 8398
Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
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GB 6307.2-1986
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Vapour vacuum pumps--Measurement of critical backing pressure
WITHDRAWN published on 1.1.1986
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GB 6308.1-1986
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Rubber seal connections of vacuum gauges
WITHDRAWN published on 1.1.1986
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GB 6308.2-1986
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Metal seal connections of vacuum gauges
WITHDRAWN published on 1.1.1986
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GB/T 6309-1986
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Dial indicators
WITHDRAWN published on 1.1.1986
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GB/T 631-1989
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Chemical reagent—Ammonia solution (25%)
WITHDRAWN published on 31.3.1989
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GB 6310-1986
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WITHDRAWN published on 1.1.1986
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GB/T 6311-1986
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Long range dial gauges
WITHDRAWN published on 24.4.1986
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GB/T 6311-2004
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Long span dial gauges reading in 0.01mm
WITHDRAWN published on 10.2.2004
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GB/T 6312-1986
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Tube micrometers
WITHDRAWN published on 24.4.1986
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GB/T 6312-2004
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Micrometer for measuring pipe wall thicknesses
WITHDRAWN published on 10.2.2004
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