B21L 11/04

Making chains or chain links of special shape each link being formed of a single member of which both ends are bent or shaped to engage the middle portions of the next link the ends being pierced or punched to form eyes

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data.epo.org/linked-data/def/cpc/B21L11-04

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Patent classification

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B21L 11/06

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Cooperative Patent Classification

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B21L 11/02

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