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公开(公告)号：US3512883A
公开(公告)日：1970-05-19
申请号：US3512883D
申请日：1967-05-19
Applicant: WILLIAM A NOBLE , DELORES E NOBLE
Inventor： NOBLE WILLIAM A , NOBLE DELORES E
IPC: G03B21/132 , G03B21/08 , G03B21/28
CPC classification number: G03B21/132 , Y10S353/05
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