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公开(公告)号：US2840500A
公开(公告)日：1958-06-24
申请号：US47689254
申请日：1954-12-22
Applicant: PIERCE JOHN B FOUNDATION
Inventor： OKOOMIAN HOWARD J , PIERCE HERRINGTON LOVIC
IPC: E04B1/80
CPC classification number: E04B1/80 , Y10S297/05 , Y10T428/24711 , Y10T428/26
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