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公开(公告)号：US2311275A
公开(公告)日：1943-02-16
申请号：US28604639
申请日：1939-07-24
Applicant: PROSPERITY CO INC
Inventor： WIEGMAN FLOYD A , YOUNG GEORGE R
IPC: D06F71/28
CPC classification number: D06F71/285
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