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PCE
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CPC Subgroup
B21D 3/12

by stretching with or without twisting (by twisting only B21D11/14)

Full Title

Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts (straightening of well casings in situ E21B; ) > by stretching with or without twisting (by twisting only B21D11/14)