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See Chinese contents: JB/T 7334-2016 JB/T 7334-2016: Hand chain blocks
This standard specifies the basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage of hand chain blocks. This standard applies to chain blocks, for general use, which are driven by involute spur gears. This standard does not apply to hand chain blocks, which are used in explosive environments.
