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公开(公告)号：US1554889A
公开(公告)日：1925-09-22
申请号：US72960924
申请日：1924-08-01
Applicant: WILLIAM A HUTSON
Inventor： SMYTHE ETHELBERT H
IPC: F01L1/16
CPC classification number: F01L1/16 , Y10T74/19898
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