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公开(公告)号：US2620114A
公开(公告)日：1952-12-02
申请号：US78662547
申请日：1947-11-18
Applicant: GRAHAM SPENCER W
Inventor： GRAHAM SPENCER W
IPC: F16N37/02
CPC classification number: F16N37/02 , Y10T137/8626
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