DIFF Subgroup
B21L 11/04 the ends being pierced or punched to form eyes
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
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 portion of the next link > the ends being pierced or punched to form eyes
CPC:
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
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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