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公开(公告)号:US2942228A
公开(公告)日:1960-06-21
申请号:US67198657
申请日:1957-07-15
Applicant: ILLINOIS TOOL WORKS
Inventor: GRANT SWICK EDWIN
公开(公告)号:US2942228A
公开(公告)日:1960-06-21
申请号:US67198657
申请日:1957-07-15
Applicant: ILLINOIS TOOL WORKS
Inventor: GRANT SWICK EDWIN