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公开(公告)号：US2642903A
公开(公告)日：1953-06-23
申请号：US225548
申请日：1948-01-14
Applicant: EFURD JR ROBERT L , EFURD EULAND A
Inventor： EFURD JR ROBERT L , EFURD EULAND A
CPC classification number: B27M1/08 , B27C1/00 , Y10T83/7693 , Y10T408/556
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