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公开(公告)号：US3353941A
公开(公告)日：1967-11-21
申请号：US37123964
申请日：1964-05-29
Applicant: EMHART CORP
Inventor： HANKS GEORGE F , BRACKEN JR ALEXANDER L
IPC: C03B5/235
CPC classification number: C03B5/235
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