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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9/00
Bending tubes using mandrels or the like
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B21D9/01
the mandrel being flexible and engaging the entire tube length
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B21D9/03
and built-up from loose elements, e.g. series of balls
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