Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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B21B
ROLLING OF METAL
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17/00
Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
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B21B17/08
with mandrel having one or more protrusions; , i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
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