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公开(公告)号：US2611134A
公开(公告)日：1952-09-23
申请号：US76247447
申请日：1947-07-21
Applicant: LOEFFELHOLZ COMPANY
Inventor： JARRETT JOHN W , TANGEMAN RUSSELL L , SCHMIDT MAX B
CPC classification number: E03D11/12 , E03C1/01 , E03C2201/90
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