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公开(公告)号：US1728500A
公开(公告)日：1929-09-17
申请号：US27411628
申请日：1928-04-30
Applicant: JOSEPH MARTORELL
Inventor： JOSEPH MARTORELL
IPC: F01L1/28
CPC classification number: F01L1/28 , Y10T137/87378
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