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公开(公告)号：US2567882A
公开(公告)日：1951-09-11
申请号：US5190348
申请日：1948-09-30
Applicant: GOYAN FRANK M , JEAN DUFRENOY
Inventor： GOYAN FRANK M , JEAN DUFRENOY
IPC: G06G1/00
CPC classification number: G06G1/00
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