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People's Republic of black metallurgy industry standard YB / T 4001.1-2007
National Development and Reform Commission issued

Foreword
YB / T 4001 "steel grating and the package" is divided into three parts:
- Part I: steel grating;
- Part II: steel railings;
- Part III: ladders.
This section YB / T 4001 Part 1.
This section refer to the use of ISO 14122-2:2001 "Safety of machinery into the machinery and industrial equipment, fixed facilities, Part 2: Working platforms and channels."
This section instead of YB / T 4001-1998 "steel grating."

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