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公开(公告)号：US883047A
公开(公告)日：1908-03-24
申请号：US1906344565
申请日：1906-11-22
Applicant: PFAU MFG COMPANY
Inventor： PFA CHARLES , PFAU EDWARD G
CPC classification number: E03D1/34 , Y10T137/8634
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