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公开(公告)号：US1869268A
公开(公告)日：1932-07-26
申请号：US53829631
申请日：1931-05-18
Applicant: MIKE MARTZ
Inventor： MIKE MARTZ
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/04 , E01B2201/08
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