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公开(公告)号：US2213521A
公开(公告)日：1940-09-03
申请号：US21504038
申请日：1938-06-21
Applicant: HAEBERLIN JR JOHN B
Inventor： HAEBERLIN JR JOHN B
IPC: B01J4/00
CPC classification number: B01J4/008 , Y10T137/289 , Y10T137/2917
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