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公开(公告)号：US2284643A
公开(公告)日：1942-06-02
申请号：US32971340
申请日：1940-04-15
Applicant: EDWARD W HEINTZELMAN
Inventor： DOYLE JOHN T
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/02 , E01B2201/04
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