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公开(公告)号：US1776004A
公开(公告)日：1930-09-16
申请号：US37671829
申请日：1929-07-08
Applicant: ALFRED LUDERS
Inventor： ALFRED LUDERS
IPC: B63B45/00
CPC classification number: B63B45/00 , B63B45/04 , B63B2201/08
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