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保存失败
公开(公告)号:US2219437A
公开(公告)日:1940-10-29
申请号:US21442838
申请日:1938-06-18
申请人: LEIF ANDERSEN , FREDRICKSON EDWARD A , NEWMAN THOMAS P , SCIVER HUGH R VAN , ZINKIL ROY H
发明人: LEIF ANDERSEN , FREDRICKSON EDWARD A , NEWMAN THOMAS P , SCIVER HUGH R VAN , ZINKIL ROY H
IPC分类号: E03D11/12
CPC分类号: E03D11/12 , Y10S4/02
公开(公告)号:US2202486A
公开(公告)日:1940-05-28
申请号:US21442938
申请人: FREDRICKSON EDWARD A , LEIF ANDERSEN , SCIVER HUGH R VAN , ZINKIL ROY H
发明人: FREDRICKSON EDWARD A , LEIF ANDERSEN , SCIVER HUGH R VAN , ZINKIL ROY H