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公开(公告)号：US3228669A
公开(公告)日：1966-01-11
申请号：US21427462
申请日：1962-08-02
Applicant: LITTLE INC A
Inventor： OLD BRUCE S , HYDE RICHARD W , SCHORA JR FRANK C
CPC classification number: B01J8/28 , C21B13/0033 , Y02P10/136
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