Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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B21D
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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53/00
Making other particular articles
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B21D53/02
heat exchangers; or parts thereof; , e.g. radiators, condensers; fins, headers
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B21D53/08
of both metal tubes and sheet metal
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