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公开(公告)号：US1346974A
公开(公告)日：1920-07-20
申请号：US14860317
申请日：1917-02-14
Applicant: PERRIN SHOCKER MFG COMPANY LTD
Inventor： HUMPHREY PERRIN WILLIAM
IPC: A01D75/06
CPC classification number: A01D75/06
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