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公开(公告)号：US2322419A
公开(公告)日：1943-06-22
申请号：US35732740
申请日：1940-09-18
Applicant: OTTIS CRANFORD LLOYD LEE
Inventor： OTTIS CRANFORD LLOYD LEE
IPC: E21B37/02
CPC classification number: E21B37/02
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