GB - Chinese national standards

Optics and photonics—Operation microscopes—Part 1: Requiremnts and test methods

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Optics and photonics—Operation microscopes—Part 2:Light hazard from operation microscopes used in ocular surgery

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Convex and concave milling cutters - Part1The types and dimensions

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Convex and concave milling cutters - Part 2Technical specifications

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Alloy structural steel plate, sheet and strip

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Cold-rolled sheet and strip of carbon structural steels

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Non-destructive testing—Practice for fabrication and control of steel reference blocks used in ultrasonic testing

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Method for eddy current testing of round steel

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Steel and iron Determination of oxygen content The pulse heating inert gas fusion-infra-red absorption method

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