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公开(公告)号：US3015142A
公开(公告)日：1962-01-02
申请号：US77388558
申请日：1958-11-14
Applicant: ROSANOFF RICHARD A , THOMAS LEROY S
Inventor： ROSANOFF RICHARD A , THOMAS LEROY S
CPC classification number: E02B17/0845 , B66C1/46 , E04G11/24 , Y10S294/902
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