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Method of and apparatus for the production of helically grooved tubes or pipes

申请公布号:GB732495(A)

申请号:GB19530000944

申请日期:1953.01.12

申请公布日期:1955.06.22

申请人:
WILHELM HEGLER

分类号:B21C37/12;B31F1/20

主分类号:B21C37/12

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