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Standards GB - Chinese national standards - Page 8521
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/T 6555-1986
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Requirements for 3-channel carrier telephone equipment on an open-wire pair
WITHDRAWN published on 1.1.1986
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GB 6556-1986
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Type, main dimension, material and marking of mechanical seals
WITHDRAWN published on 1.1.1986
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GB/T 6556-1994
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Type, main dimension, material and marking of mechanical seals
WITHDRAWN published on 27.12.1994
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GB/T 6556-2016
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Type,main dimension,material and marking of mechanical seals
WITHDRAWN published on 29.8.2016
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GB/T 6557-1999
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Mechanical vibration—Methods and criteria for the mechanical balancing of flexible rotors
WITHDRAWN published on 11.10.1999
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GB/T 6557-2009
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Mechanical vibration—Methods and criteria for the mechanical balancing of flexible rotors
WITHDRAWN published on 24.4.2009
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GB 6558-1986
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WITHDRAWN published on 1.1.1986
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GB/T 656-1977
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Chemical reagents--Ammonium dichromate
WITHDRAWN published on 4.2.1977
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GB/T 6560-1986
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Cross recessed pan head thread forming screws
WITHDRAWN published on 2.7.1986
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GB/T 6561-1986
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Cross recessed countersunk head thread forming screws
WITHDRAWN published on 2.7.1986
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