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公开(公告)号：US3106920A
公开(公告)日：1963-10-15
申请号：US80043059
申请日：1959-03-19
Applicant: WHEELDEX MFG CO INC
Inventor： SCHOLFIELD ETHEL E , SCHOLFIELD RICHARD P
IPC: B42F17/00
CPC classification number: B42F17/00 , Y10S402/501
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