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公开(公告)号：US2178009A
公开(公告)日：1939-10-31
申请号：US19384438
申请日：1938-03-04
Applicant: HELM ALLISON C
Inventor： HELM ALLISON C
IPC: B30B11/20
CPC classification number: B30B11/201 , Y10S425/101 , Y10S425/23
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