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公开(公告)号：US2527637A
公开(公告)日：1950-10-31
申请号：US69263646
申请日：1946-08-23
Applicant: WOOLERY MACHINE COMPANY
Inventor： KNIFFEN ROY S , FARNAM JULIAN P , WOOLERY WILBER F
IPC: E01B27/04
CPC classification number: E01B27/04
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