Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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B21K
MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
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21/00
Making hollow articles not covered by a single preceding sub-group
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B21K21/08
Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
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