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公开(公告)号：US1820385A
公开(公告)日：1931-08-25
申请号：US30424228
申请日：1928-09-06
Applicant: BUTTERWORTH H W & SONS CO
Inventor： WILLIS FARQUHAR JOSEPH , WALTER HENSEL
IPC: D06B5/20
CPC classification number: D06B5/20
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