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公开(公告)号：US3229918A
公开(公告)日：1966-01-18
申请号：US28568263
申请日：1963-06-05
Applicant: HELME PRODUCTS INC
Inventor： WILHELMINE TROST EVA
IPC: B02C19/06
CPC classification number: B02C19/065 , B02C19/06
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