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公开(公告)号：US2334400A
公开(公告)日：1943-11-16
申请号：US27848039
申请日：1939-06-10
Applicant: SHELL DEV
Inventor： EVANS THEODORE W , SCHEIBLI JAMES R , DE GRIENDT GERALD H VAN
CPC classification number: E04C2/16 , F16L59/027
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