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公开(公告)号:US3509983A
公开(公告)日:1970-05-05
申请号:US3509983D
申请日:1968-01-29
Applicant: BREX CORP
Inventor: ANDERSON EARL R , KEESLING CLIFFORD E
公开(公告)号:US3509983A
公开(公告)日:1970-05-05
申请号:US3509983D
申请日:1968-01-29
Applicant: BREX CORP
Inventor: ANDERSON EARL R , KEESLING CLIFFORD E