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| More topics under "B21L - Making chains" (1,891) |
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| B21L 1 - Making chains or chain links by bending workpieces of rod, wire, or strip to form links of oval or other simple shape (89) | | B21L 11 - Making chains or chain links of special shape (298) | | B21L 13 - Making terminal or intermediate chain links of special shape; Making couplings for chains, e.g. swivels, shackles (23) | | B21L 15 - Finishing or dressing chains or chain links, e.g. removing burr material, calibrating (138) | | B21L 19 - Appurtenances for chain-making not restricted to any particular process (169) | | B21L 21 - Tools or implements for repairing chains using metal-working operations, e.g. for detaching deformed chain links (156) | | B21L 3 - Making chains or chain links by bending the chain links or link parts and subsequently welding or soldering the abutting ends (123) | | B21L 5 - Making chains or chain links by working the starting material in such a way that integral, i.e. jointless, chain links are formed (55) | | B21L 7 - Making chains or chain links by cutting single loops or loop-parts from coils, assembling the cut parts and subsequently subjecting same to twisting with or without welding (36) | | B21L 9 - Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains (677) | | B21L 99 - Subject matter not provided for in other groups of this subclass (127) |
| Patents for B21L - Making chains (1) |
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| 12/05/1978 | US4127987 Machine for manufacturing chains having differentiated links |
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