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公开(公告)号：US2563077A
公开(公告)日：1951-08-07
申请号：US11458049
申请日：1949-09-08
Applicant: MILDRED HAGEN
Inventor： SCHWARTZ CARL K
IPC: D06F33/06
CPC classification number: D06F33/06 , Y10T74/1523 , Y10T74/1526 , Y10T74/1584
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