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公开(公告)号：US1392779A
公开(公告)日：1921-10-04
申请号：US20831317
申请日：1917-12-21
Applicant: SMITH ENGINEERING WORKS
Inventor： MCMANAMEN JOHN J , SMITH CHARLES F , MUNRO ALEXANDER L
IPC: B03B5/56
CPC classification number: B03B5/56
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