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公开(公告)号:US2164174A
公开(公告)日:1939-06-27
申请号:US4065635
申请日:1935-09-14
Applicant: LAMSON CO
Inventor: GERARD FRANK W , COLLINS RICHARD C
公开(公告)号:US2164174A
公开(公告)日:1939-06-27
申请号:US4065635
申请日:1935-09-14
Applicant: LAMSON CO
Inventor: GERARD FRANK W , COLLINS RICHARD C