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公开(公告)号：US1431432A
公开(公告)日：1922-10-10
申请号：US39704720
申请日：1920-07-17
Applicant: FRANK SCOBIE HERBERT , MILO LADD
Inventor： FRANK SCOBIE HERBERT , MILO LADD
IPC: G03B27/02
CPC classification number: G03B27/02
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