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in annular parts
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CPC
B21D28/30
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Parent Industries
B
PERFORMING OPERATIONS TRANSPORTING
B21
Mechanical metalworking
B21D
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING METAL
B21D28/00
Shaping by press-cutting Perforating
Current Industry
B21D28/30
in annular parts
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