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公开(公告)号:US1474789A
公开(公告)日:1923-11-20
申请号:US57200822
申请日:1922-06-30
Applicant: RHODEN JOHN W
Inventor: RHODEN JOHN W
IPC: G06M1/08 , G06M3/06
CPC classification number: G06M3/06 , G06M1/086