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公开(公告)号:US3508591A
公开(公告)日:1970-04-28
申请号:US3508591D
申请日:1968-01-04
Applicant: IBM
Inventor: JOHNSON ROBERT L , RALSTON EDWARD L
公开(公告)号:US3508591A
公开(公告)日:1970-04-28
申请号:US3508591D
申请日:1968-01-04
Applicant: IBM
Inventor: JOHNSON ROBERT L , RALSTON EDWARD L