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公开(公告)号:US2650031A
公开(公告)日:1953-08-25
申请号:US16522250
申请日:1950-05-31
Applicant: PIERCE JOHN B FOUNDATION
Inventor: HITCH ROBERT A , DA FANO ETTORE
公开(公告)号:US2650031A
公开(公告)日:1953-08-25
申请号:US16522250
申请日:1950-05-31
Applicant: PIERCE JOHN B FOUNDATION
Inventor: HITCH ROBERT A , DA FANO ETTORE