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B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21L—MAKING METAL CHAINS
B21L7/00—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
Verfahren zur selbsttaetigen Herstellung einer Schmuckkette, deren Kettenglieder in der Mitte um 180íÒgegeneinander verwunden sind, mit der Maschine nach Patent 526621 und Maschine dazu