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公开(公告)号：US1421612A
公开(公告)日：1922-07-04
申请号：US54489322
申请日：1922-03-18
Applicant: THOMAS B BLACKBURN , CHARLES F POTTER
Inventor： GEORGE SYKES
IPC: B61D45/00
CPC classification number: B61D45/006
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