Expansion shell

申请公布号：US3250170(A)

申请号：US19640350438

申请日期：1964.03.09

申请公布日期：1966.05.10

申请人：

SIEGEL NORMAN H

发明人：SIEGEL NORMAN H.

分类号：E21D21/00

主分类号：E21D21/00

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