Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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B21L
MAKING METAL CHAINS
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9/00
Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains
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B21L9/02
of roller-chain or other plate-link type
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