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公开(公告)号：US2031667A
公开(公告)日：1936-02-25
申请号：US25023828
申请日：1928-01-28
Applicant: PIPKIN
Inventor： PIPKIN MAURICE E , JUDSON BLAKE ELI
CPC classification number: B06B1/0269 , B06B2201/53 , G10K9/13
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