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公开(公告)号：US1789100A
公开(公告)日：1931-01-13
申请号：US34412229
申请日：1929-03-05
Applicant: FRANK GUST , HAMANN EVART W
Inventor： FRANK GUST , HAMANN EVART W
IPC: B61K3/00
CPC classification number: B61K3/00
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