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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28/00
Shaping by press-cutting; Perforating
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B21D28/02
Punching blanks or articles with or without obtaining scrap; Notching
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B21D28/04
Centering the work; Positioning the tools
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