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公开(公告)号：US2621858A
公开(公告)日：1952-12-16
申请号：US11644249
申请日：1949-09-19
Applicant: LEONARD D AMORE
Inventor： LEONARD D AMORE
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/10
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