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公开(公告)号：US2898194A
公开(公告)日：1959-08-04
申请号：US55494755
申请日：1955-12-23
Applicant: BASIC INC
Inventor： EELLS JR HOWARD P , PEARSON EDWARD P , LEE HARLEY C
IPC: C01F5/16
CPC classification number: C01F5/16
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