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公开(公告)号:CA775872A
公开(公告)日:1968-01-16
申请号:CA775872D
Applicant: NORRIS INDUSTRIES
Inventor: WEEKS CHARLES B , CHOATE PAUL V
公开(公告)号:CA775872A
公开(公告)日:1968-01-16
申请号:CA775872D
Applicant: NORRIS INDUSTRIES
Inventor: WEEKS CHARLES B , CHOATE PAUL V