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公开(公告)号：US2862718A
公开(公告)日：1958-12-02
申请号：US49909855
申请日：1955-04-04
Applicant: NAT RES DEV
Inventor： ERNEST STAINTON DUDLEY
IPC: B23B31/20
CPC classification number: B23B31/201 , Y10T279/17538 , Y10T279/17606
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