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公开(公告)号：US2862517A
公开(公告)日：1958-12-02
申请号：US59738056
申请日：1956-07-12
Applicant: MICHAEL KRAFT
Inventor： MICHAEL KRAFT
IPC: E03D1/32
CPC classification number: E03D1/32 , Y10T137/7384 , Y10T137/7423
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