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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B21B19/02
the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling; ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
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B21B19/06
Rolling hollow basic material,; e.g. Assel mills
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B21B19/10
Finishing, e.g. smoothing, sizing; , reeling
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