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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19/00
Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
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B21B19/12
the axes of the rollers being arranged essentially parallel to the axis of the work
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