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公开(公告)号：US3547318A
公开(公告)日：1970-12-15
申请号：US3547318D
申请日：1969-06-19
Applicant: WILLARD M CROMWELL , FRANK R PERZDIRTZ
Inventor： CROMWELL WILLARD M , PERZDIRTZ FRANK R
CPC classification number: D06F71/40
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